Mayo Clinic specialists answer health questions from readers like you.

• I quit smoking: Why am I coughing so much?
• Icy Hot: Can I use too much?
• Idiopathic anaphylaxis: What causes it?
• Idiopathic intracranial hypertension (pseudotumor cerebri)
• IgA deficiency: What is it?
• Impacted wisdom teeth: A cause of facial numbness?
• Infant botulism and honey
• Infant constipation: How is it treated?
• Infant eczema: How is it treated?
• Infant formula: Should I use tap or bottled water?
• Infant growth: What's normal?
• Infant wheezing: Is it asthma?
• Infertility: Is stress a contributing factor?
• Inflammatory breast cancer: Why is treatment so difficult?
• Infrared saunas: What are the health benefits?
• Ingrown hairs: How do you prevent them?
• Insomnia: Why can't I stay asleep?
• Insulin potentiation therapy: A dangerous alternative cancer treatment
• Insulin therapy: Does it cause weight gain?
• Insulin: Can it boost athletic performance?
• Intrauterine insemination (IUI): How is it different from IVF?
• Inversion therapy: Can it relieve back pain?
• Inverted nipple: Cosmetic problem or medical concern?
• Iritis: How is it treated?
• Irritable bowel syndrome (IBS) diet: Can yogurt help?
• Isaacs' syndrome
• Isolated systolic hypertension: A health concern?