Mayo Clinic specialists answer health questions from readers like you.

• Hair dye and pregnancy
• Hair removal: Does shaving make it grow back thicker?
• Hamstring injury
• Hand swelling during exercise: A concern?
• HCG injections: Good for weight loss?
• Headaches during pregnancy: What can I do about them?
• Healthy skin: What role does diet play?
• Hearing loss: A side effect of medication?
• Heart cancer: Is there such a thing?
• Heart palpitations: A cause for concern?
• Hemorrhoids during pregnancy: Are there safe treatments?
• Hepatitis C transmission: Is it safe to breast-feed?
• Hepatitis C treatment: Are herbal remedies effective?
• Hepatitis C: How common is sexual transmission?
• HER2-positive breast cancer
• Herbal treatment for anxiety: Is it effective?
• Hernia exam: Why do I have to cough?
• Hiccups: Causes and cures
• HIDA scan (cholescintigraphy): Why is it performed?
• Hidden penis
• High blood pressure medication: When should I take it?
• High cholesterol treatment: Does cinnamon lower cholesterol?
• High cholesterol treatment: Necessary in older adults?
• High cholesterol: Does it increase my risk of Alzheimer's?
• High eosinophil count: What are the causes?
• High hemoglobin count
• High lymphocyte count (lymphocytosis): What causes it?
• High phosphorus level
• High protein in blood: What causes it?
• High red blood cell count
• High uric acid level: What does it mean?
• High white blood cell count
• High-frequency hearing loss: Can hearing aids help?
• High-fructose corn syrup: Why is it so bad for me?
• High-protein diets: Safe for people with kidney and liver disease?
• Hip arthritis: Can hyaluronic acid injections help?
• Hip resurfacing: An alternative to hip replacement?
• Hirschsprung's disease (megacolon)
• Hirsutism (excess facial hair) in women
• Hodgkin's vs. non-Hodgkin's lymphoma: What's the difference?
• Home birth: Who shouldn't consider it?
• Home enemas for constipation: Are they safe?
• Homeopathy: Good medicine or junk science?
• Honey: A good substitute for sugar if you have diabetes?
• Honey: An effective cough remedy?
• Honey: Can it speed wound healing?
• Hoodia: An effective appetite suppressant?
• Hookah smoking: Is it safer than smoking cigarettes?
• Hormone replacement therapy: Can it cause vaginal bleeding?
• Horner syndrome: What causes it?
• Horseshoe kidney
• Hot flashes in men
• Hot tub lung: Am I at risk?
• HPV infection: Can men get it too?
• HPV infection: How does it cause cervical cancer?
• Hydronephrosis
• Hyperbaric oxygen therapy: Can it reduce stroke damage?
• Hypercalcemia (high calcium levels)
• Hyperextended knee: What are the treatment options?
• Hyperinflated lungs: What are the causes?
• Hyperinsulinemia: Is it diabetes?
• Hyperkalemia: What causes high potassium?
• Hyperplasia: Is it cancer?
• Hypersomnia: What causes it?
• Hypertensive crisis: What are the symptoms?
• Hyperthyroidism: Can it cause bone loss?
• Hypoparathyroidism
• Hypothyroidism and high cholesterol: Any connection?
• Hypothyroidism and infertility: Is there a connection?
• Hypothyroidism diet: Can certain foods increase thyroid function?
• Hypothyroidism: Can calcium supplements interfere with treatment?
• Hypothyroidism: Can it cause peripheral neuropathy?
• Hypothyroidism: Does it cause joint pain?
• Hypothyroidism: Should I take iodine supplements?
• Hypoxemia: What are the causes?
• Hysterectomy: Does it cause early menopause?