In-depth

Acute kidney failure

Amyloidosis

Amyotrophic lateral sclerosis

Amyotrophic lateral sclerosis (ALS) — often known as Lou Gehrig's disease — is a degenerative condition causing loss of control of voluntary muscles.

Anaphylaxis

Anaphylaxis is the most serious type of allergic reaction. It often occurs rapidly after exposure to an allergen and may be life-threatening.

Anorexia nervosa

Anterior prolapse (cystocele)

Appendicitis

Arthritis

Ataxia

Ataxia describes lack of muscle coordination while performing voluntary movements. A sign of an underlying condition, ataxia can affect any part of your body.

Back pain

Bed-wetting

Benign prostatic hyperplasia (BPH)

Binge-eating disorder

Bipolar disorder

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.

Blood in urine (hematuria)

Bulimia nervosa

Carcinoid tumors

Carcinoid tumors are rare, slow-growing cancerous tumors that most often occur in the gastrointestinal tract or in the lungs.

Castleman disease

Cervicitis

Chlamydia

Are you worried you might have chlamydia? Find out how this common sexually transmitted infection is diagnosed and treated.

Chronic daily headaches

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.

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.

Cushing syndrome

Cushing syndrome is caused by an excess of the hormone cortisol, originating from your adrenal glands or from corticosteroid medications you're taking for another illness.

Cyclothymia (cyclothymic disorder)

Cystitis

Dehydration

You normally lose about 10 cups (2.4 liters) of water every day — much more during exercise or illness. Learn how to stay hydrated.

Delayed ejaculation

Delirium

Delirium is a state of confused thinking and lack of awareness that often affects people with dementia, terminal illness or multiple serious medical problems.

Dementia

Diabetes insipidus

Diabetes insipidus is a rare condition characterized by intense thirst and the excretion of large amounts of urine.

Diabetic ketoacidosis

Dysarthria

Dystonia

Dystonia causes involuntary, sustained muscle contractions, resulting in repetitive movements, twisting and abnormal posture.

Edema

Epididymitis

Erectile dysfunction

Febrile seizure

Heat exhaustion

Heatstroke

Hemolytic uremic syndrome (HUS)

Hemolytic uremic syndrome is an uncommon condition that can cause life-threatening kidney failure, especially for children and older adults.

Henoch-Schonlein purpura

Henoch-Schonlein purpura causes inflammation of small blood vessels (vasculitis) and often a purplish rash. It's most common in children ages 2 to 6.

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.

Histoplasmosis

HIV/AIDS

Horner syndrome

Hydrocele

Hyperparathyroidism

Hyponatremia

Hypoparathyroidism

IgA nephropathy (Berger's disease)

IgA nephropathy (Berger's disease) is a kidney disorder caused by abnormal deposits of immunoglobulin A (IgA) inside your kidneys.

Infant jaundice

Infant jaundice, a yellowing of the skin and eyes, is common after birth. Careful monitoring and treatment is important for preventing rare, but serious, complications.

Infant reflux

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

Interstitial cystitis

Frequent urination and pelvic pain may indicate interstitial cystitis, a chronic bladder inflammation. There's no cure, but some treatments offer relief.

Interstitial lung disease

Kidney cancer

Kidney infection

Kidney stones

Listeria infection

Most people exposed to listeria don't become ill. But for those at risk of a listeria infection — a foodborne illness — the consequences can be severe.

Lupus

Lynch syndrome

Membranous nephropathy

Nephrotic syndrome

Non-Hodgkin's lymphoma

Orchitis

Overactive bladder

Pelvic inflammatory disease (PID)

Pheochromocytoma

Pituitary tumors

Pituitary tumors are abnormal growths in the pituitary gland in the brain. Most are noncancerous (benign). Some may cause overproduction of hormones and associated problems.

Postpartum preeclampsia

Prostatitis

Prostatitis, inflammation of the prostate gland, can cause significant male pelvic pain and other symptoms.

Retrograde ejaculation

Retrograde ejaculation occurs when semen enters the bladder instead of emerging through the penis during orgasm. Find out about symptoms and treatment.

Rett syndrome

Parenting a child with Rett syndrome can be challenging. Here's what to expect and steps you can take to help your child.

Reye's syndrome

Rickets

Rickets is a severe and prolonged vitamin D deficiency that leads to softening and weakening of the bones in children.

Scrotal masses

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.

Sepsis

Sexually transmitted diseases

Sjogren's syndrome

Stress incontinence

Sweating and body odor

Excessive sweating and body odor can be embarrassing. Find out the possible causes and what you can do about this personal problem.

Testicular torsion

Toxic shock syndrome

Trichomoniasis

Type 1 diabetes

Type 2 diabetes

Urinary incontinence

Urine color

Vaginal atrophy

You don't have to accept vaginal problems as part of getting older. Discover treatment options.

Vaginal dryness

Vaginal dryness is a common and uncomfortable condition — but there are effective ways to treat it.

Vasculitis

Vesicoureteral reflux

Wegener's granulomatosis

Wegener's granulomatosis is an uncommon disease that causes blood vessel inflammation that can damage lungs, kidneys and other organs. Untreated, it can be fatal.

Wilms' tumor

Feb. 15, 2014