Mayo Clinic specialists answer health questions from readers like you.

• L-arginine: Does it lower blood pressure?
• Lactation suppression: When you choose not to breast-feed
• Laryngospasm: What causes it?
• Late-day exercise: Does it worsen insomnia?
• Late-night eating: OK if you have diabetes?
• Lead in lipstick: A health concern?
• Leftovers: How long can you safely keep them?
• Leg pain after prolonged standing or sitting: A concern?
• Leg swelling: A concern if I have diabetes?
• Lentils: How do I cook with them?
• Lesion: What does it mean?
• Lipitor and Zocor: Are they equally effective?
• Lipodissolve: Does it get rid of unwanted fat?
• Lipovarin: Another 'miracle' weight-loss drug?
• Liquid vitamins vs. pills: Does one work better than the other?
• Livedo reticularis: What causes it?
• Liver cysts: A cause of abdominal pain?
• Liver function tests: What do they involve?
• Liver hemangioma: Does it cause any symptoms?
• Lobelia supplements: Can they curb nicotine cravings?
• Lorazepam: Is it addictive?
• Loss of sense of smell (anosmia): What causes it?
• Loss of sex drive in men: A consequence of aging?
• Loss of taste and smell: A normal part of aging?
• Low amniotic fluid: Should I worry?
• Low birth weight: What does it mean?
• Low blood pressure: A cause of Alzheimer's?
• Low blood sodium (hyponatremia) in older adults
• Low hemoglobin
• Low phosphorus diet for kidney disease
• Low potassium (hypokalemia): What causes it?
• Low sperm count (oligospermia): Can it be treated?
• Low white blood cell count (leukopenia)
• Low-fat foods: Not always low calorie?
• Low-grade astrocytoma: Does it require treatment?
• Low-sodium diet: Why is processed food so salty?
• Lower back tattoo: Will it prevent an epidural?
• Lower-than-normal body temperature: A concern?
• Lumbar puncture (spinal tap)
• Lung cancer diagnosis: Is earlier detection possible with breath test?
• Lung cancer: Can nonsmokers get it?
• Lung nodules: Can they be cancerous?
• Lupus: Can it cause hair loss?
• Lupus: Can it cause hives?
• Lupus: How does it affect the kidneys?