(HealthDay News) -- Dry mouth is more than just uncomfortable. A lack of saliva to moisten your mouth also can lead to tooth damage, the American Dental Association warns.

(HealthDay News) -- A muscle cramp occurs when a contracted muscle can't relax, causing pain and tightness.

TUESDAY, Feb. 28 (HealthDay News) -- Exposure to bisphenol A (BPA), a controversial chemical commonly used to make plastics, increases a person's risk of developing heart disease later in life, a new study suggests.

SUNDAY, March 4 (HealthDay News) -- People with asthma fare better on a type of food-allergy test called a "food challenge" than non-asthmatics, new research suggests.

SATURDAY, March 3 (HealthDay News) -- A mother's exposure to tobacco smoke during the last three months of pregnancy may increase the risk that her child will develop the allergic skin condition eczema during infancy, a new study suggests.

SATURDAY, March 3 (HealthDay News) -- One in 10 American truck drivers, train conductors, airline pilots and other transportation workers may be dangerously sleep-deprived, a new survey suggests.

MONDAY, March 5 (HealthDay News) -- Patients suffering from advanced heart failure should maintain an open dialogue with their physicians, so everyone is on the same page with patients' long-range personal wishes regarding treatment, experts say.

MONDAY, March 5 (HealthDay News) -- Whole-body CT scans can confirm immediately whether severe trauma patients have certain injuries, but these tests could miss other serious problems if performed too early, a new study indicates.

SUNDAY, March 4 (HealthDay News) -- Overweight children may not respond as well to common asthma medicines known as inhaled corticosteroids, new research finds.

SUNDAY, March 4 (HealthDay News) -- Vitamin E may stimulate cells that result in bone loss, a new study suggests.

MONDAY, March 5 (HealthDay News) -- Preteen and teenage girls whose diets are rich in vitamin D may be at lower risk for stress fractures, particularly if they are involved in high-impact activities, according to a new study.

MONDAY, March 5 (HealthDay News) -- Older people with heart disease who have undergone a cardiac catheterization may be at much greater risk for mental decline if they also show persistent signs of depression, according to a new study.

MONDAY, March 5 (HealthDay News) -- The more adolescents watch movie stars sidle up to the bar on the big screen, the more alcohol they drink themselves, a new study suggests.

MONDAY, March 5 (HealthDay News) -- Infants and toddlers who snore or have other breathing issues while sleeping are more likely to develop behavioral problems by the age of 7, new research suggests.

MONDAY, March 5 (HealthDay News) -- Children with asthma have a higher risk for developing shingles -- a painful skin rash -- following infection with the herpes zoster virus, new research reveals.

MONDAY, March 5 (HealthDay News) -- Babies born just a few weeks early appear to face a greater risk of developing asthma when compared with children born at full term, new research reveals.

MONDAY, March 5 (HealthDay News) -- A new Canadian study provides more evidence that too many young kids may be diagnosed with attention-deficit/hyperactivity disorder, or ADHD, simply because they're younger than their peers in the same classrooms.

Here are some of the latest health and medical news developments, compiled by the editors of HealthDay:

MONDAY, March 5 (HealthDay News) -- For years, women with the severe form of premenstrual syndrome known as premenstrual dysphoric disorder (PMDD) were told that their symptoms should subside the day menstruation begins.

MONDAY, March 5 (HealthDay News) -- Pregnant women taking certain antidepressants may be more likely to deliver infants with reduced head growth, a new study suggests.

MONDAY, March 5 (HealthDay News) -- New guidelines for colorectal cancer screening from the American College of Physicians (ACP) put the emphasis on individual risk.

MONDAY, March 5 (HealthDay News) -- Some children who suffer a concussion will display continued difficulties, such as attention and memory problems, for many months, a new study finds.