(HealthDay News) -- Many women are uncomfortable before and during the monthly menstrual cycle, but more intense symptoms may be more than just premenstrual syndrome (PMS).

(HealthDay News) -- Weight-bearing exercises help strengthen bones and muscles by making them work against gravity.

MONDAY, March 28 (HealthDay News) -- Teenagers who begin smoking at an early age are much more likely to start using marijuana by the time they're 17, researchers report.

MONDAY, March 28 (HealthDay News) -- Seeing other people scratching can cause your brain to trigger your own itch, researchers suggest.

MONDAY, March 28 (HealthDay News) -- Some women who've been treated for early-stage breast cancer are more likely than others to worry excessively that the cancer will return, a new study has found.

MONDAY, March 28 (HealthDay News) -- One-third of patients with resistant high blood pressure have so-called "white coat hypertension," a new study suggests.

SUNDAY, March 27 (HealthDay News) -- Smoking is damaging to everyone's health, but the nicotine in cigarettes may be even more deadly for people who have diabetes.

MONDAY, March 28 (HealthDay News) -- Teens who undergo gastric bypass weight loss surgery can expect to have a decline in bone mass, just as adults do, according to a new study.

MONDAY, March 28 (HealthDay News) -- Social media Web sites, such as Facebook and Twitter, have become nearly inescapable facets of modern life, particularly for kids. And a new report suggests they can have real benefits and risks for children.

MONDAY, March 28 (HealthDay News) -- "Surgeon enthusiasm" is a major reason why surgeons in some areas are more likely to recommend surgery for low back problems, according to a new study.

MONDAY, March 28 (HealthDay News) -- Fennel extract, herbal tea and sugar water relieved colic in some infants better than a placebo, according to a new study that reviewed clinical trials of alternative remedies for colic.

MONDAY, March 28 (HealthDay News) -- More than half of the nearly 500 writers and reviewers of recent cardiology clinical practice guidelines reported a conflict of interest due to ties with drug makers and other companies, a new study finds.

MONDAY, March 28 (HealthDay News) -- Severely obese men and women who have bariatric surgery may shed more than just excess pounds: They may also reduce much of their pre-surgery risk for experiencing disabling migraines, researchers say.

MONDAY, March 28 (HealthDay News) -- Memories of devastating heartbreaks appear to trigger activity in the brain that's similar to when people suffer physical pain, new research suggests.

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

(HealthDay News) -- Here are the latest clinical trials, courtesy of ClinicalConnection.com:

MONDAY, March 28 (HealthDay News) -- Radiation from the full-body scanners increasingly used to screen U.S. airline passengers is not a significant health threat, University of California researchers report.

MONDAY, March 28 (HealthDay News) -- The lives of millions of aging Americans are threatened by an irregular heartbeat called atrial fibrillation, which raises their risk for stroke. But a new report finds that the condition doesn't have to arise as often as it does.

MONDAY, March 28 (HealthDay News) -- As the debate over medical marijuana use continues, a new study among multiple sclerosis patients -- who often use the drug to relieve pain and muscle spasticity -- adds to the argument that smoking pot clouds thinking skills.

MONDAY, March 28 (HealthDay News) -- Adding the stress hormone cortisol to more traditional exposure therapy may help anxious patients overcome their fear of heights, researchers say.