In-depth

Acromegaly

Acute kidney injury

Acute lymphocytic leukemia

Acute myelogenous leukemia

Acute sinusitis

Addison's disease

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 kidney disease

Chronic lymphocytic leukemia

Chronic myelogenous leukemia

Chronic sinusitis

Churg-Strauss syndrome

Colon cancer

Common cold

Concussion

Crohn's disease

Cushing syndrome

Cyclothymia (cyclothymic 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

Fibromyalgia

Follicular lymphoma

Gaucher disease

Generalized anxiety disorder

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

HIV/AIDS

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

Jet lag disorder

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

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

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

Sjogren syndrome

Small lymphocytic lymphoma

Small vessel disease

Smallpox

Somatic symptom disorder

Stomach cancer

Strep throat

Sudden cardiac arrest

Sunburn

Takayasu's arteritis

T-cell lymphoma

Teen depression

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

Vitamin deficiency anemia

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