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Q. I believe aspirin is a miracle drug. I’ve used it for pain relief for years and never once had a stomachache or heartburn.

My doctor told me it was prudent to take a baby aspirin every day to prevent circulatory problems. I just read that the Food and Drug Administration has warned against this practice. How come?

A. The FDA recently declared that aspirin is too dangerous for people to use to prevent heart attacks or strokes unless they have already experienced a cardiovascular crisis.

This warning contradicts advice from the American Heart Association, the American Diabetes Association as well as the U.S. Preventive Services Task Force. All of these organizations recommend low-dose aspirin for at-risk people to prevent an initial heart attack or stroke.

According to the FDA, aspirin can lead to bleeding in the intestines or the brain. The agency considers the risk too high for otherwise healthy people. We think, however, that this decision is best made through a conversation between patients and their personal physicians. Recent research suggests that regular aspirin use may have an added anti-cancer benefit that could change the equation for certain individuals (Current Oncology Reports, December 2013).

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Q. Years ago, a friend of mine was put on a low-sodium diet as a general precaution. Prior to this, he was in good health. He became so dizzy that he had to hold on to the walls to move around his house.

His doctors were confounded and ran lots of tests, but they ignored the results: He had extremely low sodium. They told him to keep avoiding salt.

His condition worsened, and he became nearly housebound. When his daughter, a cardiac-care nurse, came to visit, she was alarmed. She took him to her physician, who was shocked at his low sodium level and put him back on salt. Within days, he was up and about. As a result, I’m skeptical about medical advice to avoid salt!

A. Low sodium levels can be life-threatening. Extreme salt restriction may be as dangerous as excessive salt intake (American Journal of Hypertension online, March 20, 2014).

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Q. Most mornings, I awaken with extremely puffy eyelids; often my fingers are swollen as well. It takes several hours for this to recede, and the heaviness of my eyelids makes me feel very tired.

My doctor prescribed a diuretic that I take occasionally for the swelling. I worry that I will lose important minerals with this treatment. Is there another alternative?

Controlling dietary factors does not affect the swelling. What could be causing it? I am physically active and maintain a nutritious diet.

A. Ask your doctor to test you for thyroid function. Puffy eyelids and swollen hands and feet can be symptoms of an underactive thyroid gland. Fatigue is one of the most common signals that the gland is not working well.

The Guide to Thyroid Hormones we are sending you outlines many other symptoms of low thyroid activity as well as medicines that may affect thyroid test results. It also describes the treatments for low thyroid. Anyone who would like a copy, please send $3 in check or money order with a long (No. 10), stamped (70 cents), self-addressed envelope to: Graedons’ People’s Pharmacy, No. T-4, P.O. Box 52027, Durham, NC 27717-2027. It also can be downloaded for $2 from our website: www.peoplespharmacy.com.