In-depth

Twisting the knee can cause a common knee injury known as a torn meniscus. Treatment sometimes includes surgery.

Abdominal aortic aneurysm

An abdominal aortic aneurysm is a dangerous condition in which a part of your body's main artery (aorta) is enlarged and in danger of rupturing.

ACL injury

An active life that includes sports may also include the risk of a torn ACL. Reduce your risk, and know when to get treatment.

Acute kidney failure

Acute kidney failure is the sudden loss of your kidneys' ability to filter waste from your bloodstream. Correcting the underlying cause increases the likelihood of recovery.

Acute lymphocytic leukemia

Acute lymphocytic leukemia is a type of leukemia that affects immature white blood cells. It's the most common cancer in children and adolescents.

Adenomyosis

Adenomyosis can cause painful, excessive bleeding during menstrual periods. Explore symptoms and treatment.

Adult Still's disease

Daily fevers, achy joints and an intermittent, salmon-pink rash may be an indication that you have a rare inflammatory disorder called adult Still's disease.

Alcoholic hepatitis

Alcohol can severely damage your liver — even moderate drinkers aren't immune. Learn more about this serious liver disease.

Ambiguous genitalia

Ambiguous genitalia is a condition in which a newborn's external genitals don't appear clearly male or female.

Amenorrhea

Although the absence of menstruation (amenorrhea) is seldom serious, the condition can often be linked to an underlying problem requiring treatment.

Anal cancer

Though anal cancer is rare, incidence of anal cancer is increasing. Find out the symptoms and causes of cancer of the anal canal.

Appendicitis

Arteriovenous fistula

An arteriovenous fistula is a treatable blood vessel condition in which your blood doesn't flow normally through your capillaries. Untreated, it can lead to complications.

Ascariasis

Ascariasis is a common type of roundworm infection found worldwide. It's spread by poor hygiene and improper sanitation. Infections are effectively treated with medication.

Atelectasis

Atelectasis, or collapsed lung, is a possible complication of many respiratory conditions. Find out what causes it and how it's treated.

Autonomic neuropathy

Autonomic neuropathy refers to damage to or disease affecting the involuntary nerves.Autonomic neuropathy refers to damage to or disease affecting the involuntary nerves.

Back pain

Back pain is a common reason for health care visits and missed work. Home treatment and proper body mechanics can help you feel better.

Baker's cyst

A Baker's cyst is a swollen area behind your knee. Treating the primary cause — such as arthritis or a cartilage tear — usually helps relieve pain.

Bladder stones

Bladder stones are small masses of minerals in your bladder — often forming as a result of an enlarged prostate, nerve damage or infection.

Breast cancer

Breast cancer is the disease that many women fear most. But early detection and lifestyle changes may reduce your risk.

Breast pain

Breast pain is a common problem for women. But while it can be worrisome and uncomfortable, it rarely signals cancer or another serious health condition.

Cancer

Learn about cancer, what it looks like and what causes it.

Cerebral palsy

Cerebral palsy — Comprehensive overview covers symptoms, causes and treatment of this movement disorder.

Cholestasis of pregnancy

Chronic exertional compartment syndrome

Don't ignore exercise-related pain, pressure or numbness, because it may indicate chronic exertional compartment syndrome. Proper treatment can get you back to your favorite sport.

Chronic kidney disease

Chronic kidney disease, often caused by diabetes or high blood pressure, is the gradual loss of kidney function. Early detection and treatment can help.

Chronic pelvic pain in women

Chronic pelvic pain is pain in your pelvic region — the area below your bellybutton and between your hips — that lasts six months or longer.

Cleft lip and cleft palate

Cleft lip and cleft palate are common birth defects. Surgical correction allows children with clefts to live normal and healthy lives.

Clubfoot

Clubfoot is a treatable birth defect in which the foot twists awkwardly at the ankle. Untreated, an awkward gait and other problems may result.

Congenital adrenal hyperplasia

Congenital adrenal hyperplasia is a genetic condition affecting the adrenal glands and interfering with normal growth and development in boys and girls.

Conjoined twins

Conjoined twins are identical twins most often joined at the chest, head or pelvis. In some cases, conjoined twins can be surgically separated.

Cystitis

Cystitis is an inflammation of the urinary bladder. It's most often caused by a bacterial infection but may have other causes.

Deep vein thrombosis

Double uterus

Double uterus is a rare condition that sometimes goes undiagnosed throughout a woman's life. Find out how a double uterus can affect your reproductive health.

Ectopic pregnancy

An ectopic pregnancy can't continue normally — but prompt treatment can help prevent life-threatening blood loss.

Edema

Edema — swelling caused by excess fluid in tissues — can affect any part of your body. Treating the underlying cause is key to resolving edema.

Endometrial cancer

Endometrial cancer is one of the most common cancers in women. If detected early, this cancer is often successfully treated.

Endometriosis

Endometriosis is a common and often painful disorder in which tissue that normally lines the inside of your uterus grows outside your uterus.

Enlarged liver

You can get an enlarged liver from a number of medical problems or personal habits. Treatment depends on what's causing the enlargement.

Epididymitis

Epididymitis is an inflammation of the tube at the back of the testicle (epididymis). The condition is usually treated with antibiotics.

Erectile dysfunction

Erectile dysfunction (ED) can be the result of physical or psychological causes or both. Discover what causes ED and what treatments are available.

Eye melanoma

Although melanoma is commonly a type of skin cancer, it can also occur in your eye. Eye exams can often detect this rare cancer.

Fetal macrosomia

Fetal macrosomia — Overview covers risk factors and complications related to delivering a large baby.

Fibrocystic breasts

Fibrocystic breasts feel lumpy, and they're prone to soreness before your period. They're sometimes uncomfortable, but fibrocystic breast changes are common.

Foot drop

Foot drop is a general term used to describe difficulty lifting the front part of the foot. Treatment depends on the underlying cause.

Galactorrhea

Galactorrhea is a milky discharge from the nipple not associated with the normal milk production of breast-feeding.

Ganglion cyst

Ganglion cysts are noncancerous fluid-filled lumps (cysts) that sometimes develop in the tendons or joints of the wrist, hand or foot.

Glomerulonephritis

Glomerulonephritis affects your kidneys' filtering function. Complications include high blood pressure, protein in the urine (proteinuria) and kidney failure.

Goiter

Goiter is an enlargement of the thyroid gland due to a variety of causes. The condition can cause difficulty swallowing or breathing.

Greenstick fractures

The extra flexibility of children's bones makes them more prone to greenstick fractures — an injury in which a bone bends and cracks.

Growth plate fractures

Growth plate fractures can interfere with your child's normal bone growth, resulting in a stunted or twisted limb. Prompt, proper care is essential.

Gynecomastia

Gynecomastia, enlarged breasts in males, is a common problem. Find out about treatments and how to cope.

Hamstring injury

Hamstring injury — Comprehensive overview covers symptoms, treatments, self-care, prevention of this leg muscle injury.

High blood pressure in children

High blood pressure in children and adolescents is often caused by another health condition, but is usually treatable with diet and exercise.

High potassium (hyperkalemia)

High potassium (hyperkalemia) has many possible causes, including reduced kidney function. Hyperkalemia can be life-threatening if not treated.

Hirsutism

Hirsutism refers to excessive hair growth in women. Possibly a result of elevated male hormones, hirsutism is often caused by an underlying condition.

Hurthle cell cancer

Hurthle cell cancer is a rare type of thyroid cancer. Surgical removal of the thyroid gland is usually required.

Hydrocele

A hydrocele is a generally harmless fluid-filled sac that surrounds a testicle, causing scrotal swelling. However, it may indicate a more serious condition.

Incompetent cervix

Incompetent cervix — Overview covers symptoms, risks and treatment of weak cervical tissue during pregnancy.

Infant reflux

Spit up happens. Often, changes in feeding technique help keep reflux under control.

Inflammatory breast cancer

Inflammatory breast cancer occurs when cancer cells clog lymphatic vessels in the skin of the breast. It's a rare but deadly form of cancer.

Intussusception

A rare but serious disorder, intussusception occurs when one part of the intestine slides into an adjacent part, often causing intestinal obstruction.

Invasive lobular carcinoma

Invasive lobular carcinoma is a form of breast cancer that develops in a milk-producing lobule of breast tissue.

Iron deficiency anemia

Iron deficiency anemia may leave you feeling sapped of energy. This condition is especially common in women. Iron supplements usually help.

Ischemic colitis

Ischemic colitis is a disorder in which the colon becomes inflamed, usually due to a disruption of blood flow.

Kidney cancer

When kidney cancer is diagnosed and treated early, the chances for recovery are better.

Kidney stones

Kidney stones often recur. Find out what causes kidney stones and how to prevent them.

Knee bursitis

Knee pain

Find out what could cause knee pain.

Lipoma

A lipoma is a fatty tumor located just below the skin. Treatment usually isn't necessary.

Liver cancer

The risk of liver cancer may be reduced by protecting yourself from serious liver diseases such as cirrhosis and hepatitis B and C.

Liver hemangioma

Liver hemangioma is the most common type of noncancerous (benign) liver mass. Learn how doctors treat liver hemangioma.

Lynch syndrome

Lynch syndrome, an uncommon disorder caused by genetic defects, predisposes a person to develop colon cancer and other forms of cancer.

Male breast cancer

For male breast cancer, awareness and early diagnosis are key to successful treatment.

Mammary duct ectasia

Mammary duct ectasia is a noncancerous breast condition in which the milk ducts beneath the nipple become wider, clogged and sometimes inflamed.

Membranous nephropathy

Your kidney's filtering system is damaged and valuable proteins leak from the body.

Menorrhagia

Menstrual cramps

A monthly period is bad enough. Add in painful menstrual cramps, and you may be cursing this thing called womanhood. How do you get relief?

Miscarriage

Miscarriage can be heartbreaking. It might help to understand possible causes and treatment options, as well as what to expect for the future.

Molar pregnancy

Molar pregnancy — Comprehensive overview covers symptoms, treatment of this tumor in the uterus.

Morning sickness

Morning sickness is common in pregnancy. Learn what to expect and how to relieve your symptoms.

Morton's neuroma

Morton's neuroma is a growth of nerve tissue in your foot that may be caused by pressure or irritation. It can be painful.

Muscular dystrophy

Muscular dystrophy is an inherited disease resulting in progressive weakness of the body's muscles. Some forms are milder; others, more severe.

Myelofibrosis

In myelofibrosis, healthy bone marrow is replaced with scar tissue, leading to severe anemia and fatigue.

Myofascial pain syndrome

Myofascial pain syndrome is caused by sensitive knots of tissue in your muscles.

Neuroblastoma

Neuroblastoma most commonly affects children age 5 and younger. It's the most common form of cancer in babies.

Nonalcoholic fatty liver disease

Nonalcoholic fatty liver disease is associated with obesity and diabetes. Lifestyle changes may prevent it from becoming serious.

Orchitis

Orchitis, a painful inflammation of one or both testicles, may be caused by the mumps virus or a bacterial infection.

Osteoporosis

Osteoporosis — developing fragile bones with age — threatens the independence of many older people, especially women. Learn how to avoid bone loss and fractures.

Ovarian hyperstimulation syndrome

Ovarian hyperstimulation syndrome (OHSS) — Comprehensive overview covers symptoms, treatment of this complication of infertility treatment.

Painful intercourse (dyspareunia)

At some point, many women experience painful intercourse — for many different reasons. Here's how to discuss the problem and get treatment.

Pancreatic cancer

Pancreatic cancer is often fatal. Find out which new treatments offer hope.

Patellar tendinitis

Don't let the common term "jumper's knee" fool you. Patellar tendinitis can affect anyone — no matter how frequently or infrequently you jump.

Peripheral artery disease

Peripheral artery disease is a common circulation problem affecting the arteries carrying blood to your limbs. Painful in itself, it could signal larger circulatory problems.

Peritonitis

Peritonitis is an infection of the membrane that lines your inner abdominal wall and covers the organs within your abdomen (peritoneum).

Placenta previa

Placenta previa is a pregnancy complication that can cause excessive bleeding before or during delivery. Treatment may include bed rest or a C-section birth.

Placental abruption

Placental abruption is a dangerous pregnancy complication. Control your risk factors — and know when to seek emergency care.

Pleurisy

Pleurisy is the painful inflammation of the membranes that surround your lungs. The cause can be one of a number of underlying conditions.

Polymyalgia rheumatica

Polymyalgia rheumatica is an inflammatory disorder that causes pain and stiffness in the neck, shoulders, upper arms, hips and thighs.

Precocious puberty

Precocious puberty is a rare condition in which the physical signs of puberty begin to develop too early in children.

Premature birth

Having a preemie can be overwhelming. Here's what you need to know about your baby's care and the possible complications of a premature birth.

Preterm labor

Preterm labor — Comprehensive overview covers the symptoms, treatment and prevention of preterm labor.

Priapism

Priapism is a prolonged and usually painful erection. Prompt evaluation is necessary to prevent damage to the penis.

Prostate cancer

Prostate cancer is a common cancer affecting men. But with early detection, you improve your chances of successful treatment.

Pulmonary embolism

Pulmonary embolism occurs when one or more arteries in your lungs become blocked. Surgery, cancer, family history and long airplane trips may place you at risk.

Pyloric stenosis

Comprehensive overview covers symptoms, treatment of this uncommon digestive condition in infants.

Retinal detachment

Retinal detachment is a medical emergency. Without prompt treatment, this condition can lead to permanent loss of vision.

Retinoblastoma

Retinoblastoma is a cancerous tumor of the eye that generally affects young children. If retinoblastoma is detected early, a cure is possible.

Rotator cuff injury

A rotator cuff injury is a painful shoulder condition often caused by lifting, falling or repetitive motions. Explore treatments including exercise therapy, medications and surgery.

Sacral dimple

A sacral dimple is an indentation in the skin on the lower back — usually just above the crease between the buttocks.

Sacroiliitis

Sacroiliitis is one cause of low back pain and discomfort. It's an inflammation of the sacroiliac joints, which connect the lower spine and pelvis.

Secondary hypertension

Secondary hypertension is a type of high blood pressure that's caused by another medical condition. Prompt treatment is often necessary to avoid complications.

Soft tissue sarcoma

Soft tissue sarcomas are uncommon cancers that originate in the soft tissues of your body.

Solitary rectal ulcer syndrome

Solitary rectal ulcer syndrome, a rare condition, may be caused by chronic constipation. Dietary changes may help mild cases.

Spermatocele

Spermatoceles are noncancerous, often painless growths that develop on the coiled tube near the top of a testicle. They're common and usually require no treatment.

Spina bifida

Takayasu's arteritis

Takayasu's arteritis is an uncommon form of vasculitis that affects the large arteries.

Tapeworm infection

Tapeworms most commonly enter your body through contaminated food or water. Symptoms aren't always present, but the prognosis is good with prompt diagnosis and treatment.

Testicular cancer

Testicular cancer is highly treatable, even when it has spread beyond the testicle.

Thrombophlebitis

Thrombophlebitis occurs when a blood clot and swelling develop in a vein, typically in your leg. The cause often is prolonged inactivity or bed rest.

Thyroid cancer

For people diagnosed with the most common forms of thyroid cancer, the prognosis is usually excellent.

Thyroid nodules

Most thyroid nodules — lumps in the thyroid gland — cause no problems. But nodules that affect swallowing, produce excess thyroid hormone or are malignant require treatment.

Toxic hepatitis

Toxic hepatitis is liver damage that occurs when your liver isn't able to break down certain toxins — including common pain relievers such as Tylenol.

Toxoplasmosis

Toxoplasmosis is an infection caused by a parasite. It doesn't make most people ill, but infants and people with HIV/AIDS are at risk of complications.

Tricuspid atresia

A heart with tricuspid atresia doesn't have a tricuspid valve. This heart defect prevents blood flow from the right atrium to the right ventricle.

Tuberous sclerosis

Tuberous sclerosis is a rare genetic disease. With appropriate treatment, many people who have tuberous sclerosis lead full, productive lives.

Undescended testicle

Undescended testicle is a testicle that hasn't moved into its proper position in the scrotum prior to birth. The condition often corrects itself.

Uterine fibroids

Uterine fibroids are noncancerous tumors of the uterus. Medical therapy and surgical procedures can shrink or remove uterine fibroids.

Uterine prolapse

A sensation of sitting on a small ball or something falling out of your vagina could mean you have uterine prolapse.

Varicose veins

Varicose veins are enlarged veins commonly found close to your skin's surface. Self-help measures can prevent them from getting worse; removing them is an option.

Vasculitis

Vasculitis is an inflammation of the blood vessels. It can affect people of any age. Treatment depends on the type of vasculitis.

Water on the knee

Water on the knee refers to excess fluid inside or around your knee joint. Find out what causes this common knee problem.

Whiplash

Whiplash is a neck injury often linked to auto accidents. Discover which treatments work and which don't.

Wilms' tumor

Wilms' tumor is a rare kidney cancer that primarily affects children.

Zollinger-Ellison syndrome

In Zollinger-Ellison syndrome, tumors in the pancreas or duodenum secrete a hormone called gastrin that leads to excessive stomach acid and ulcers.

Feb. 23, 2012