In-depth

Acromegaly

Acute kidney injury

Acute lymphocytic leukemia

Acute myelogenous leukemia

Acute sinusitis

Addison's disease

Alcoholic hepatitis (Alcohol-associated hepatitis)

Alpha-1-antitrypsin deficiency

Amyloidosis

Anaphylaxis

Anemia

Angina

Anorexia nervosa

Anthrax

Anxiety disorders

Aortic valve regurgitation

Aortic valve stenosis

Aplastic anemia

ARDS

Arteriovenous fistula

Ascariasis

Aspergillosis

Astrocytoma

Atrial septal defect (ASD)

Atrioventricular canal defect

Autoimmune hepatitis

B-cell lymphoma

Bipolar disorder

Blastocystis hominis

Bone cancer

Bradycardia

Brain tumor

Bronchitis

Brucellosis

Brugada syndrome

Burkitt lymphoma

Cancer

Cardiomyopathy

Castleman disease

Celiac disease

Chagas disease

Chemo brain

Cholangiocarcinoma (bile duct cancer)

Cholera

Chronic lymphocytic leukemia

Chronic myelogenous leukemia

Chronic sinusitis

Cirrhosis

Colon cancer

Common cold

Concussion

Crohn's disease

Cushing syndrome

Cyclothymia (cyclothymic disorder)

Depression (major depressive disorder)

Dermatomyositis

Diabetes

Diabetes affects how your body uses blood sugar. Too much blood sugar over long periods can cause serious health problems, but treatments are available.

Diabetic coma

Diabetic ketoacidosis

Diffuse large B-cell lymphoma

Diffuse midline glioma (DMG)

Dilated cardiomyopathy

Dumping syndrome

Ebstein anomaly

Encephalitis

Endocarditis

Endometriosis

Enlarged liver

Enlarged spleen (splenomegaly)

Esophageal cancer

Ewing sarcoma

Fatty liver disease (MASLD)

Fibromyalgia

Follicular lymphoma

Gaucher disease

Giardia infection (giardiasis)

Glomerulonephritis

Granulomatosis with polyangiitis

Graves' disease

H1N1 flu (swine flu)

Hairy cell leukemia

Hangovers

Hashimoto's disease

Heart arrhythmia

Heart attack

Heart disease

Heart failure

Heat exhaustion

Heavy menstrual bleeding

Hemochromatosis

Hemolytic uremic syndrome (HUS)

Hepatitis A

Hepatitis B

Hepatitis C

Hiatal hernia

Hilar cholangiocarcinoma

Hirschsprung's disease

HIV/AIDS

Hodgkin lymphoma (Hodgkin disease)

Huntington's disease

Hypercalcemia

Hyperglycemia in diabetes

Hyperparathyroidism

Hyperthyroidism (overactive thyroid)

Hypertrophic cardiomyopathy

Hyponatremia

Hypoparathyroidism

Hypopituitarism

Hypothermia

Inflammatory bowel disease (IBD)

Influenza (flu)

Insomnia

Iron deficiency anemia

Jet lag disorder

Kidney cancer

Lead poisoning

Legionnaires' disease

Leukemia

Listeria infection

Liver cancer

Liver disease

Long QT syndrome

Low blood pressure (hypotension)

Lupus

Lymphoma

Male hypogonadism

Mantle cell lymphoma

Medulloblastoma

Membranous nephropathy

Mental illness

Metastatic (stage 4) prostate cancer

Metastatic castration-resistant prostate cancer (mCRPC)

Mitral valve prolapse

Mitral valve regurgitation

Mitral valve stenosis

Mixed connective tissue disease

Mononucleosis

Multiple myeloma

Multiple sclerosis

Multisystem inflammatory syndrome in children (MIS-C)

Mumps

Myelodysplastic syndromes

Myelofibrosis

Myocarditis

Non-Hodgkin lymphoma

Pancreatic neuroendocrine tumors

Parvovirus infection

Pectus excavatum

Pelvic inflammatory disease (PID)

Pericarditis

Peripheral T-cell lymphoma

Peritoneal carcinomatosis

Peritonitis

Persistent depressive disorder

Persistent post-concussive symptoms (Post-concussion syndrome)

Pineal gland tumor

Plague

Pneumonia

Pneumonitis

Polio

One of the most feared diseases of the 20th century, polio has been eradicated from the developed world but remains a threat in less developed nations.

Polycythemia vera

Polymyalgia rheumatica

Post COVID syndrome

Postpartum depression

Post-polio syndrome

Prediabetes

Premenstrual syndrome (PMS)

Primary biliary cholangitis (PBC)

Primary mediastinal large B-cell lymphoma

Primary sclerosing cholangitis (PSC)

Pulmonary atresia

Pulmonary edema

Pulmonary fibrosis

Pulmonary hypertension

Pulmonary valve stenosis

Rectal cancer

Rheumatoid arthritis

Roseola

Sarcoidosis

Sheehan's syndrome

Shingles

Sick sinus syndrome

Sinus headaches

Small vessel disease

Somatic symptom disorder

Stomach cancer

Strep throat

Sudden cardiac arrest

Sunburn

Takayasu's arteritis

T-cell lymphoma

Teen depression

Tetralogy of Fallot

Thalassemia

Tonic-clonic (grand mal) seizure

Toxic hepatitis

Toxoplasmosis

Tricuspid atresia

Tuberculosis

Type 1 diabetes

Type 1 diabetes in children

Type 2 diabetes

Type 2 diabetes in children

Typhoid fever

Ulcerative colitis

Valley fever

Vasculitis

Ventricular septal defect (VSD)

VEXAS syndrome

Viral hemorrhagic fevers

Viral hepatitis

Vitamin deficiency anemia

Von Willebrand disease

Waldenstrom macroglobulinemia

West Nile virus

Whiplash

Whipple's disease

Whooping cough

Wilson's disease

Wolff-Parkinson-White (WPW) syndrome

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Feb. 20, 2026

See also

  1. ​Self-care for fatty liver disease (MASLD)
  2. 6 tips to manage rheumatoid arthritis symptoms
  3. A leaky tricuspid valve
  4. Acute lymphocytic leukemia
  5. Acute sinusitis
  6. Addison's disease
  7. Adenocarcinoma: How this type of cancer affects prognosis
  8. Amyloidosis
  9. Anaphylaxis: First aid
  10. Anemia
  11. Angina
  12. Anorexia nervosa
  13. Anthrax
  14. Antidepressants and weight gain: What causes it?
  15. Antidepressants: Can they stop working?
  16. Anxiety disorders
  17. Aortic calcification: An early sign of heart valve problems?
  18. Aortic valve regurgitation
  19. Aortic valve stenosis
  20. ARDS
  21. Artificial sweeteners: Any effect on blood sugar?
  22. Ascariasis
  23. At-home colon cancer tests
  24. Bipolar disorder
  25. Bipolar disorder and alcoholism: Are they related?
  26. Bipolar disorder in children: Is it possible?
  27. Blastocystis hominis
  28. Blood sugar testing: Why, when and how
  29. Blood tests for heart disease
  30. Bone cancer
  31. Brain tumor
  32. Bronchitis
  33. Cancer blood tests: Lab tests used in cancer diagnosis
  34. Cancer causes: Popular myths about the causes of cancer
  35. Cancer fatigue: Why it occurs and how to cope
  36. Cancer pain: Relief is possible
  37. Cancer surgery: Physically removing cancer
  38. Cancer survival rate: What it means for your prognosis
  39. Cardiac asthma: What causes it?
  40. Celiac disease
  41. Chelation therapy for heart disease: Does it work?
  42. Chemo brain
  43. Chronic kidney disease
  44. Chronic sinusitis
  45. Coconut oil: Can it cure hypothyroidism?
  46. Cold symptoms: Does drinking milk increase phlegm?
  47. Colon Cancer Family Registry
  48. Colon cancer prevention: What you can do
  49. Common cold
  50. Concussion
  51. Concussion in children: What are the symptoms?
  52. Coping with anxiety: Can diet make a difference?
  53. Craving and chewing ice: A sign of anemia?
  54. Crohn's Crisis
  55. Crohn's disease and the gut microbiome
  56. Cutaneous B-cell lymphoma
  57. Depression and anxiety: Exercise eases symptoms
  58. Dermatomyositis
  59. Diabetes and exercise: When to monitor your blood sugar
  60. Diabetes and heat
  61. Diabetes care: 10 ways to avoid complications
  62. Diabetes foods: Can I substitute honey for sugar?
  63. Diabetes management: How lifestyle, daily routine affect blood sugar
  64. Diabetes treatment: Using insulin to manage blood sugar
  65. Diabetic ketoacidosis
  66. Dilated cardiomyopathy
  67. Does stress make rheumatoid arthritis worse?
  68. Drummer Beats Heart Disease
  69. Dumping syndrome
  70. Early HIV symptoms: What are they?
  71. Ebstein anomaly
  72. ED Drugs for Pulmonary Hypertension
  73. Effectively managing chronic kidney disease
  74. Endometriosis FAQs
  75. Enlarged spleen (splenomegaly)
  76. Esophageal cancer
  77. Ewing sarcoma
  78. Explaining multiple sclerosis
  79. Fatty liver disease (MASLD) diet
  80. Fertility preservation: Understand your options before cancer treatment
  81. Fibromyalgia
  82. Flu shot: Your best bet for avoiding influenza
  83. Flu shots: Especially important if you have heart disease
  84. Flu vaccine: Safe for people with egg allergy?
  85. Follicular lymphoma
  86. Gaucher disease
  87. Genetics and Cardiomyopathy
  88. GI Stents
  89. Giardia infection (giardiasis)
  90. Glycemic index: A helpful tool for diabetes?
  91. Grass-fed beef: What are the heart-health benefits?
  92. Graves' disease
  93. Healthy Heart for Life!
  94. Heart attack
  95. Heart attack prevention: Should I avoid secondhand smoke?
  96. Heart attack symptoms: Know what's a medical emergency
  97. Heart Attack Timing
  98. Heart disease
  99. Heart disease in women: Understand symptoms and risk factors
  100. Heart failure
  101. Heat exhaustion
  102. Heavy periods: Can folic acid help?
  103. Hepatitis B and Hepatitis C: What's the difference?
  104. Hepatitis C
  105. Hepatitis C screening
  106. Hepatitis C: What happens in end-stage liver disease?
  107. Herbal treatment for anxiety: Is it effective?
  108. High-dose flu vaccines: How are they different from other flu vaccines?
  109. High-dose vitamin C: Can it kill cancer cells?
  110. Hodgkin lymphoma (Hodgkin disease)
  111. Hodgkin vs. non-Hodgkin lymphoma: What's the difference?
  112. How cancer spreads
  113. How do I reduce fatigue from rheumatoid arthritis?
  114. How kidneys work
  115. Hypercalcemia
  116. Hyperthyroidism (overactive thyroid)
  117. Hypertrophic cardiomyopathy
  118. Hyponatremia
  119. Hypothermia
  120. Hypothyroidism (underactive thyroid)
  121. Hypothyroidism: Can calcium supplements interfere with treatment?
  122. Hypothyroidism: Does it cause joint pain?
  123. Influenza (flu)
  124. Infographic: Multiple Myeloma
  125. Infographic: Pancreatic Neuroendocrine Tumors
  126. Insomnia: How do I stay asleep?
  127. Insulin and weight gain: Keep the pounds off
  128. Is there a special diet for Crohn's disease?
  129. Jack Long — Live LONG - Beat STRONG to find a cure
  130. Jet lag disorder
  131. Kidney Cancer
  132. Kidney cancer FAQs
  133. Kidney disease FAQs
  134. Lack of sleep: Can it make you sick?
  135. Latent autoimmune diabetes in adults (LADA): What is it?
  136. Lead poisoning
  137. Liver disease: How medications can harm the liver
  138. Long Term Brain Cancer Survivor
  139. Low blood cell counts: Side effects of cancer treatment
  140. Low blood sodium in older adults: A concern?
  141. Low-phosphorus diet: Helpful for kidney disease?
  142. Lyme disease
  143. Lymphoma FAQs
  144. Male depression: Understanding the issues
  145. Male hypogonadism
  146. Mayo Clinic Minute: Why getting vaccinated for the flu is doubly important this season
  147. Mayo Clinic Minute: Will there be a Lyme disease vaccine for humans?
  148. Medications for liver failure
  149. Medicines that treat ulcerative colitis
  150. Mental health providers: Tips on finding one
  151. Mental health: Overcoming the stigma of mental illness
  152. Mental illness
  153. Metastatic castration-resistant prostate cancer (mCRPC)
  154. Mitral valve overview
  155. Mitral valve regurgitation
  156. Multiple myeloma
  157. Multiple sclerosis FAQs
  158. Multisystem inflammatory syndrome in children (MIS-C)
  159. Mumps
  160. Natural remedies for depression: Are they effective?
  161. Neti pot: Can it clear my nose?
  162. Non-Hodgkin lymphoma
  163. NSAIDs: Do they increase my risk of heart attack and stroke?
  164. Nuts and your heart: Eating nuts for heart health
  165. Omega-6 fatty acids: Can they cause heart disease?
  166. Pancreatic neuroendocrine tumors
  167. Parvovirus infection
  168. Pericarditis
  169. Peripheral T-cell lymphoma
  170. Peritoneal carcinomatosis
  171. Peritonitis
  172. Petroleum jelly: Safe for a dry nose?
  173. PICC line placement
  174. Pineal gland tumor
  175. Pituitary tumors and adenomas
  176. Plague
  177. Polio
  178. Postpartum depression
  179. Premenstrual dysphoric disorder
  180. Prescription sleeping pills: What's right for you?
  181. Prostate cancer recurrence
  182. Pulmonary atresia with intact ventricular septum
  183. Reactive hypoglycemia: What can I do?
  184. Rectal cancer
  185. Red wine and resveratrol: Good for your heart?
  186. Rhabdomyolysis
  187. Rheumatoid arthritis
  188. Rheumatoid arthritis: Does pregnancy affect symptoms?
  189. Robotic heart surgery treats mitral regurgitation: Ed's story
  190. Sarcoidosis
  191. Self-care for the flu
  192. Shingles
  193. Shingles vaccine: Can I transmit the vaccine virus to others?
  194. Shingles vaccine: Should I get it?
  195. Sick sinus syndrome
  196. Silent heart attack: What are the risks?
  197. Sinus headaches
  198. Small lymphocytic lymphoma
  199. Smallpox
  200. Test anxiety: Can it be treated?
  201. Thalassemia
  202. The dawn phenomenon: What can you do?
  203. The gut microbiome and its role in ulcerative colitis
  204. Thyroid disease: Can it affect a person's mood?
  205. Thyroid peroxidase antibody test: What is it?
  206. Tips for recovering after an ulcerative colitis flare-up
  207. Tips to make your mornings easier
  208. Treating Pericarditis
  209. Tricuspid atresia
  210. Tricuspid valve regurgitation
  211. Tuberculosis
  212. Type 1 diabetes FAQs
  213. Type 2 diabetes
  214. Typhoid fever
  215. Ulcerative colitis vs. Crohn's disease
  216. Understanding complement 3 glomerulopathy (C3G)
  217. Valley fever
  218. Vasculitis
  219. VEXAS syndrome
  220. Video: Heart and circulatory system
  221. Video: Septal myectomy and apical myectomy
  222. Viral hepatitis
  223. Vitamin deficiency anemia
  224. Von Willebrand disease
  225. Walking pneumonia
  226. What is a heart failure action plan?
  227. What is biliary tract cancer?
  228. What is cirrhosis? A Mayo Clinic expert explains
  229. What is Crohn's disease? A Mayo Clinic expert explains
  230. What is kidney cancer? An expert explains
  231. What is kidney disease? An expert explains
  232. What is stomach cancer? A Mayo Clinic expert explains
  233. What is type 1 diabetes? A Mayo Clinic expert explains
  234. What is ulcerative colitis? A Mayo Clinic expert explains
  235. When cancer returns: How to cope with cancer recurrence
  236. White stool: Should I be concerned?
  237. Whooping cough
  238. Whooping cough
  239. Why isn't there a hepatitis C vaccine?
  240. Zinc for colds: The final word?