(HealthDay News) -- Preeclampsia occurs when there's a swift and significant spike in blood pressure during pregnancy. It can be dangerous for both the pregnant woman and the unborn baby.

(HealthDay News) -- Symptoms of autism can be difficult to recognize in very young children, especially in mild cases or in instances when a child has other mental or physical conditions.

THURSDAY, May 3 (HealthDay News) -- New research suggests that a partial duplication of a gene played a significant role in a major advance in human brain evolution that occurred a few million years ago.

THURSDAY, May 3 (HealthDay News) -- Children born after a longer-than-normal pregnancy are at increased risk for behavioral and emotional problems, a new study suggests.

THURSDAY, May 3 (HealthDay News) -- Researchers who found a way to rejuvenate aged blood-forming cells in mice say their achievement offers clues about how it may be possible to combat health problems associated with old age.

THURSDAY, May 3 (HealthDay News) -- All blonds are not alike, according to a new study that finds different genes dictate flaxen locks in different areas of the globe.

THURSDAY, May 3 (HealthDay News) -- People diagnosed in the emergency room with a specific type of bleeding stroke should immediately be transferred to a hospital that treats at least 35 of these cases each year, according to new recommendations from the American Heart Association and the American Stroke Association.

THURSDAY, May 3 (HealthDay News) -- A new study finds that antipsychotic drugs can help many people with schizophrenia, cutting patients' risk of relapse by 60 percent.

THURSDAY, May 3 (HealthDay News) -- Women smokers with certain gene variants are at increased risk for menopausal hot flashes compared to smokers without these genetic differences, a new study says.

THURSDAY, May 3 (HealthDay News) -- More than half of women in their 40s diagnosed with breast cancer after a routine mammogram had no family history of the disease, finds a new study that may add to the debate over the timing of breast cancer screening.

THURSDAY, May 3 (HealthDay News) -- Migraine headaches are more likely to plague people with celiac disease than those without it, according to new research.

THURSDAY, May 3 (HealthDay News) -- A study that followed recently unemployed people for five months -- or until they landed a new job -- found that staying positive and being persistent helped people find work sooner.

THURSDAY, May 3 (HealthDay News) -- The use of the anti-HIV drug tenofovir during pregnancy appears to be safe for infants, new research suggests.

THURSDAY, May 3 (HealthDay News) -- Despite the fact that Americans spend more on their health care than citizens of 12 other developed nations, a new report finds that more does not necessarily equal better when it comes to quality of care.

THURSDAY, May 3 (HealthDay News) -- Jogging regularly could add about six years to your life, a new Danish study suggests.

THURSDAY, May 3 (HealthDay News) -- When diagnosed with lupus, one in three people already has kidney inflammation, and during the first 10 years with the disease as many as 60 percent of patients will have some kidney problems.

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

THURSDAY, May 3 (HealthDay News) -- More teenage girls are using contraceptives, which may explain part of the dramatic drop in the U.S. teen pregnancy rate, federal health officials reported Thursday.

THURSDAY, May 3 (HealthDay News) -- A group of Italian researchers has uncovered evidence that regardless of how "full" a person may feel, the body is hard-wired to chemically reward itself by overeating when tempted by yummy foods.