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

ARDS

Arteriovenous fistula

Ascariasis

Aspergillosis

Astrocytoma

Atrial septal defect (ASD)

Atrioventricular canal defect

Autoimmune hepatitis

B-cell lymphoma

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 kidney disease

Chronic lymphocytic leukemia

Chronic myelogenous leukemia

Chronic sinusitis

Cirrhosis

Colon cancer

Common cold

Concussion

Crohn's disease

Cushing syndrome

Cutaneous B-cell lymphoma

Cyclothymia (cyclothymic disorder)

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)

Hemophilia

Hepatitis A

Hepatitis B

Hepatitis C

Hiatal hernia

Hilar cholangiocarcinoma

Hirschsprung's disease

Hodgkin lymphoma (Hodgkin disease)

Huntington's disease

Hypercalcemia

Hyperglycemia in diabetes

Hyperparathyroidism

Hyperthyroidism (overactive thyroid)

Hypertrophic cardiomyopathy

Hyponatremia

Hypoparathyroidism

Hypopituitarism

Hypothermia

Hypothyroidism (underactive thyroid)

Influenza (flu)

Insomnia

Iron deficiency anemia

Kidney cancer

Lead poisoning

Legionnaires' disease

Leukemia

Listeria infection

Liver cancer

Liver disease

Long QT syndrome

Low blood pressure (hypotension)

Lupus

Lyme disease

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

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

Pituitary tumors and adenomas

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)

Prostate cancer recurrence

Pulmonary atresia

Pulmonary atresia with intact ventricular septum

Pulmonary edema

Pulmonary fibrosis

Pulmonary hypertension

Pulmonary valve stenosis

Rectal cancer

Rheumatic fever

Rheumatoid arthritis

Roseola

Sarcoidosis

Sheehan's syndrome

Shingles

Sick sinus syndrome

Sinus headaches

Small lymphocytic lymphoma

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

Tricuspid valve regurgitation

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

Von Willebrand disease

Waldenstrom macroglobulinemia

West Nile virus

Whiplash

Whipple's disease

Whooping cough

Wilson's disease

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