Mayo Clinic specialists answer health questions from readers like you.

• Factor V deficiency: Is it inherited?
• Factor V Leiden: Are there different types?
• Failure to thrive: When your baby isn't growing normally
• Fainting during urination (micturition syncope): What causes it?
• Fallopian tubes: Can I get pregnant with only one?
• Fast weight loss: What's wrong with it?
• Fat but fit: Can I still be healthy?
• Fat grams vs. percentages: Which is more important?
• Female infertility: Is it inherited?
• Female orgasm: Why can't I climax during sexual intercourse?
• Femara side effects: Is bone loss a concern?
• Fertility herbs and supplements: Do they enhance fertility?
• Fiber supplements: Safe to take every day?
• Fibrocystic breast disease: Does it increase the risk of breast cancer?
• Fibromuscular dysplasia: A cause of high blood pressure?
• Fibromyalgia treatment: Can Botox injections relieve pain?
• Fibrous dysplasia
• Fish oil supplements: A possible treatment for depression?
• Fitness ball exercises: Good for my abs?
• Flaxseed: Can it relieve hot flashes?
• Flaxseed: Does it increase my prostate cancer risk?
• Flaxseed: Is ground or whole better?
• Flu shot in pregnancy: Is it safe?
• Flu shot: Will it prevent the stomach flu?
• Flu shots: Do children need them?
• FluMist: Safe if you're breast-feeding?
• Foamy urine: What does it mean?
• Folic acid supplements: Can they prevent heart disease?
• Folic acid supplements: Can they slow cognitive decline?
• Food allergy: Can it develop later in life?
• Food intolerance vs. food allergy: What's the difference?
• Foods that help you sleep: Does warm milk really work?
• Foot swelling during air travel: What causes it?
• Fosamax: Does it cause osteonecrosis of the jaw?
• Freckles and moles: What's the difference?
• Free blood pressure machines: Are they accurate?
• Freezing eggs: An option for future pregnancies?
• Freezing meat: Does it kill harmful bacteria?
• Freezing plastic bottles: Does it release dioxins?
• Frequent bowel movements: Should I be concerned?
• Frequent nosebleeds: What causes them?
• Frequent sex: Does it protect against prostate cancer?
• Fructose intolerance: Which foods should I avoid?
• Fruit juice: Is it good or bad for kids?
• Fuchs' dystrophy: How is it treated?
• FucoThin: Can it help burn fat?
• Fundal height: An accurate indicator of fetal growth?