Mayo Clinic specialists answer health questions from readers like you.

• E. coli: How can I tell if food is contaminated?
• 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?
• Echinacea: Is it effective for the common cold?
• Eclipse cigarettes: Safer than regular cigarettes?
• Ectropion: A cause of sagging of the lower eyelid
• Eczema bleach bath: Can it improve my symptoms?
• Eczema treatment: Does sun exposure help or hurt?
• Eggs: Are they good or bad for my cholesterol?
• Ejection fraction: What does it measure?
• Elder care for Alzheimer's: Choosing a provider
• Electric toothbrush: Better than a manual toothbrush?
• Electromyography (EMG)
• Electronic cigarettes: A safe way to light up?
• Elevated liver enzymes: What does it mean?
• Elliptical machines: Better than treadmills?
• Emphysema: Does cold weather make it worse?
• Endometrial cancer: When is adjuvant therapy necessary?
• Endometriosis after hysterectomy: What causes recurrence?
• Endometriosis: Risk factor for ovarian cancer?
• Energy drinks: Do they really boost energy?
• Enlarged heart: What are the causes?
• Enlarged pancreas: A symptom of pancreatic cancer?
• Entropion: What causes it?
• Epidermolysis bullosa
• Epidural steroid injections for back pain: Why limited dosing?
• Epilepsy without seizures: Is this possible?
• Erectile dysfunction treatment: Can herbal remedies help?
• Erectile dysfunction: An early indicator of heart disease?
• Esophageal manometry
• Essential thrombocythemia: What causes it?
• Essential thrombocythemia: When is drug therapy necessary?
• Exercise after vitreous detachment: Is it safe?
• Exercise and illness: Work out with a cold?
• 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 dilation: Necessary with every eye exam?
• Eye exam: Is a laser retina scan worthwhile?
• 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?