Mayo Clinic specialists answer health questions from readers like you.

• E. coli: Does tainted food smell bad?
• Ear candling: Is it safe?
• Ear stapling for weight loss: Does it work?
• Early HIV symptoms: What are they?
• Early menarche: A risk factor for cancer?
• Early miscarriage: Is stress a factor?
• Early prostate cancer antigen (EPCA): A better prostate cancer test?
• Eclipse cigarettes: Safer than regular cigarettes?
• Ectropion: A cause of sagging of the lower eyelid
• Eczema treatment: Does sun exposure help or hurt?
• Eggs: Are they good or bad for my cholesterol?
• Ejection fraction: What does it measure?
• Electric toothbrush: Better than a regular toothbrush?
• Electromyography (EMG)
• Elevated CA 125 level: A sign of ovarian cancer?
• Elevated liver enzymes: What does it mean?
• Elliptical machines: What are the fitness benefits?
• Emphysema: Does cold weather make it worse?
• End-stage hepatitis C: What to expect
• Endometrial cancer: When is adjuvant therapy necessary?
• Endometriosis after hysterectomy: What causes recurrence?
• Energy drinks: Are they bad for my heart?
• Energy drinks: Do they really give you energy?
• Enlarged heart: What are the causes?
• Enlarged pancreas: A symptom of pancreatic cancer?
• Enlarged prostate: Should I avoid sexual activity?
• Entropion: What causes it?
• Epidermolysis bullosa
• Epidural steroid injections for back pain: Why limited dosing?
• Epilepsy and erectile dysfunction: Is there a connection?
• Epilepsy and learning disorders: Are they related?
• Epilepsy and the menstrual cycle: What's the connection?
• Epilepsy without seizures: Is this possible?
• Erectile dysfunction treatment: Can herbal remedies help?
• Erectile dysfunction: An early indicator of heart disease?
• Erectile dysfunction: What causes a lopsided erection?
• Esophageal manometry
• Essential thrombocythemia: What causes it?
• Essential thrombocythemia: When is drug therapy necessary?
• Excessive saliva: A concern?
• Exercise after vitreous detachment: Is it safe?
• Exercise during pregnancy: Is heart rate a concern?
• Exercise: How much do I need every day?
• Expiration dates on medications: Why are they important?
• Exploding head syndrome
• Eye exam: Do I need a laser retina scan?
• Eye exercises to improve vision: Do they work?
• Eye floaters: Do they indicate a serious problem?
• Eye twitch: What causes it?
• Eye vitamins: Can they prevent or treat glaucoma?