Ask the Doctor

About half of Americans have herpes simplex virus type 1, which causes cold sores that can recur periodically. The virus can't be eliminated, but topical and oral treatments can help. In addition, people can avoid cold sore triggers such as stress or fatigue.

Long QT syndrome is a disorder of the heart’s electrical system that can be either acquired (for example, due to a medication) or congenital. Although usually people have no symptoms, it can cause a fast, erratic heartbeat that may lead to shortness of breath, fainting, and sometimes death.

Several conditions can cause people to feel cold when others are comfortable. These include low body weight, an underactive thyroid, low red blood cell count (anemia), and Raynaud's phenomenon.

As we get older, noticeable bruises are usually related to thinning skin and increasing fragility of the tiny blood vessels in the outer layer of skin. There is not much people can do about this, but they should see their doctors if bruising is excessive or becomes painful.

Early signs of cervical cancer can include blood-tinged vaginal discharge, heavier discharge than usual, spotting or bleeding between periods, menstrual flow that’s heavier or lasts longer than usual, bleeding or pain during or after intercourse, and vaginal bleeding after menopause.

Toasted skin syndrome is a rash that develops in a fishnet-like pattern from direct, chronic, low-level exposure to heat sources such as laptops, electric blankets, heating pads, and heated car seats. The heat dilates superficial blood vessels under the skin, causing the rash.

Red wine headaches are a common phenomenon. Scientists believe they're due to a flavonoid called quercetin, which may block a key enzyme that breaks down alcohol in the liver and allows the buildup of a chemical called acetaldehyde that can trigger headaches.

Although urinary tract infections (UTIs) are far more common in women, men can also get them. Signs and symptoms include frequent urination, burning or tingling during or just after urination, cloudy urine with a strong odor, or blood in the urine. UTIs can be treated with antibiotics.

No evidence suggests that nicotine patches promote weight loss. Nicotine suppresses appetite but also raises health risks such as high blood pressure and narrowed arteries. People can talk to a doctor about medically supervised weight loss.

X-rays can detect a broken bone, dislocation, or joint problem. People should seek an x-ray if an injury results in severe pain; severe or persistent swelling or bruising; difficulty moving or bearing weight; or a noticeable deformity.