Listen to what your body is telling you! OB/GYN Dr. Manny Alvarez answers questions from viewers on hair loss, bruising, night sweats and more. (Of course, your best bet is to ask your own physician about any medical issues you're having.)

Therese, 25, loses a lot of hair when she brushes and styles it.

Dr. Manny: "A lot of times when you lose your hair, it has to do a lot with hormones (estrogen for women, testosterone for men) but typically it has a lot to do with nutrition. Vitamins like the B-complex and vitamin A sometimes do help. Try to implement those vitamins into your diet and hopefully it will change."

Carmine sweats at night. He sweats so profusely, he often has to change his pillow cases and sheets in the middle of the night.

Dr. Manny: "Check your room and make sure it's nice and cool, and don't overdress. Two major things you need to worry about: Your thyroid (sometimes thyroid problems have a lot to do with metabolism. It makes you sweat at night.) Also, your sugar. You gotta check for diabetes. Check those two things out, then the rest will be ruled out."

Shannon has been on a rollercoaster ride with weight loss for the past few years. She eats lots of fruits and vegetables, drinks water but still can't seem to keep the weight off.

Dr. Manny: You might need to switch the kind of fruit or vegetables you're taking in because sometimes the sugar content has a lot of calories. First thing you have to do is monitor the calories in and the calories that you burn daily. Try to rev up [your metabolism] and have snacks during the day. Then of course have a physical. Make sure your doctor sees you because again, you want to make sure you don't have an underactive thyroid."

Peter snores incessantly every night and wants to know if there's something he can do about it.

Dr. Manny: "Snoring is very common ... but if you wake up in the middle of the night and if you wake up with a headache, it could be that you have sleep apnea ... when you're sleeping and you stop breathing [for a few seconds]. If you keep doing it and you have sleep apnea, [as you get older] you're going to end up with high blood pressure and it puts you at risk for stroke. So you have to go to a sleeping center. The point is you have to tackle it, you have to deal with it."

Darlene suffers from cold hands and feet, even in the 90-degree weather!

Dr. Manny: "In a healthy individual, there are many serious medical reasons for it but the most common reason is lifestyle. If you drink a lot of caffeinated drinks, those things vasoconstrict. In other words, they narrow the blood vessels in your hands. so you always feel like you're cold. Change those drinks, drink a little regular water and go see a doctor [if it doesn't improve]."

Jamie bruises very easily. If she bumps into something, she gets a bruise right away.

Dr. Manny: "If you're very thin, that happens. You have to go to a doctor to check you don't have any coagulation problems. The other thing is your diet. There are certain vitamins like vitamin C or vitamin K that have been regularly linked with bruising so you want to tank up a little bit more on the citrus juice. Kiwi also has a lot of vitamin C. That might improve your bruising. Go see a doctor to make sure it's nothing else."