Mayo Clinic specialists answer health questions from readers like you.

• Caffeine and depression: Is there a link?
• Caffeine: Can it boost a woman's sex drive?
• Caffeine: Does it affect blood sugar?
• Caffeine: Does it help you lose weight?
• Caffeine: How does it affect blood pressure?
• Caffeine: Is it dehydrating or not?
• Calciphylaxis in end-stage kidney failure: How is it treated?
• Calcium supplements: Do men need them too?
• Calcium supplements: Do they interfere with blood pressure drugs?
• Calcium supplements: How to take them
• Calcium-fortified juice: A good source of calcium for kids?
• Calories in sushi: What are the low-cal options?
• Candida cleanse: Does it treat candidiasis?
• Canned food: How long can you safely keep it?
• Canned pumpkin: Better than fresh?
• Canola oil: Is it harmful to your health?
• Carbohydrate counting and diabetes: Looking beyond carbs
• Cardiac asthma
• Cardiac ischemia
• Cardiac stents: Can they be replaced?
• Carotid artery dissection: What are the signs and symptoms?
• Carpal tunnel syndrome exercise: Can I lift weights?
• Cataract surgery: Does the artificial lens deteriorate over time?
• Cause of flu deaths?
• Celiac disease: Can gluten be absorbed through the skin?
• Celiac disease: Fitting grains into your diet
• Cellulitis infection: Is it contagious?
• Cervical cancer screening: Does HPV testing beat the Pap smear?
• Cervical cancer: Can you get it if you haven't had sex?
• Cervical cysts: Can they be cancerous?
• Cervical dysplasia: Is it cancer?
• Chapped lips: What is the best remedy?
• Chelation therapy: Can it reverse heart disease?
• Chemobrain: Can Ritalin alleviate symptoms?
• Chemotherapy side effects: A cause of heart disease?
• Chiari malformation
• Chickenpox and pregnancy: What are the concerns?
• Chickenpox vaccination: Is it 100 percent effective?
• Chilblains: What causes it?
• Child abuse: How does it cause borderline personality disorder?
• Child growth: Can I predict my child's adult height?
• Childhood schizophrenia: How early can it be diagnosed?
• Chocolate: Does it impair calcium absorption?
• Cholesterol drugs after stroke: Can they speed recovery?
• Cholesterol drugs: Why keep taking them if my cholesterol levels are normal?
• Cholesterol level: Can it be too low?
• Cholesterol ratio: Is it important?
• Cholesterol test kits: Are they accurate?
• Chondrocalcinosis
• Chondroitin: Is it linked to prostate cancer?
• Choosing a calcium supplement
• Choosing sunglasses: Is UV protection important?
• Chronic bladder infection: What are my treatment options?
• Chronic diarrhea: A concern after gallbladder removal?
• Chronic fatigue: Can herbal remedies boost my energy?
• Chronic inflammatory demyelinating polyneuropathy (CIDP)
• Chronic migraine
• Chronic stress: Can it cause depression?
• Churg-Strauss syndrome
• Cigar smoking: Safer than cigarettes?
• Cimzia: A new drug treatment for Crohn's disease?
• Cinnamon: Can it lower blood sugar?
• Circuit training exercise programs: Do they really work?
• Coconut oil: A cure for thyroid disease?
• Codependency: What are the signs?
• Coenzyme Q10: Can it prevent statin side effects?
• Coffee calories: How many in your cup?
• Coffee: Does it offer health benefits?
• Cold agglutinin syndrome: What are the symptoms?
• Cold and flu germs: How long can they survive outside the body?
• Cold laser therapy: A treatment option for knee pain?
• Cold or allergy: Which is it?
• Cold sores: Can my lip balm reinfect me?
• Cold symptoms: Does drinking milk increase phlegm?
• Colloidal silver: Is it safe?
• Colon cleansing: Helpful or harmful?
• Complete blood count (CBC): What is it?
• Concave chest (pectus excavatum)
• Conflicting mammogram results: What should I do?
• Congenital adrenal hyperplasia
• Congestive heart failure: Is air travel safe?
• Constipation during pregnancy: Can I take stool softeners?
• Constipation in Alzheimer's: What causes it?
• Convergence insufficiency: What causes it?
• Coping with anxiety: Can diet make a difference?
• Coral calcium: Safe for people with shellfish allergies?
• Coronary artery disease: Angioplasty vs. bypass surgery?
• Coronary artery spasm: A cause of heart attacks?
• Corticosteroids: A cause of low potassium (hypokalemia)?
• Corticosteroids: Can they cause infertility in women?
• Cortisol blockers: Can they help you lose weight?
• Cosmetic vaginoplasty: Is it safe?
• Coughing up blood (hemoptysis)
• Coxsackievirus infection in children: Is it serious?
• Craniosynostosis: Is surgery necessary?
• Craving and chewing ice: A sign of anemia?
• Crestor: Asian-Americans at increased risk of serious side effect
• Crocs shoes: Do they relieve lower back pain?
• Crohn's disease in children: Are growth delays permanent?
• Crohn's disease treatment in children: What are the concerns?
• Crohn's disease: Can diet worsen symptoms?
• Crohn's disease: Coping with fatigue
• Croup treatment: Does high humidity relieve symptoms?
• CT scans: Are they safe?
• Cupping therapy: Can it relieve fibromyalgia pain?
• Curcumin: Can it slow cancer growth?
• Cytomegalovirus (CMV) in pregnancy