WEDNESDAY, Aug. 13 (HealthDay News) -- An estimated 25 percent of Hispanics in the United States don't have a regular health care provider to treat their medical needs.

And these people tend to be the newest documented and undocumented immigrants and those without health insurance, a new survey found.

WEDNESDAY, Aug. 6 (HealthDay News) -- Medicinal marijuana helps relieve neuropathic pain in people with HIV, says a University of California, San Diego, School of Medicine study.

It included 28 HIV patients with neuropathic pain that wasn't adequately controlled by opiates or other pain relievers. The researchers found that 46 percent of patients who smoked medicinal marijuana reported clinically meaningful pain relief, compared with 18 percent of those who smoked a placebo.

FRIDAY, Aug. 1 (HealthDay News) -- For women who find traditional mammograms painful, new research suggests there may one day be a more comfortable alternative.

Breast CT scans showed some advantages over traditional mammograms, said study author John Boone, vice chairman of radiology at the University of California Davis Medical Center. He presented the findings this week at the American Association of Physicists in Medicine annual meeting, in Houston.

WEDNESDAY, July 30 (HealthDay News) -- Researchers have uncovered a potential cause for postpartum depression, at least in mice.

According to the study, from assistant researcher Jamie Maguire and lead researcher Istvan Mody, both of the David Geffen School of Medicine at the University of California, Los Angeles, dysregulation of a particular class of proteins called GABA receptors on the surface of certain neurons in the brain may induce post-delivery mood disorders ranging from "baby blues" to postpartum psychosis.

MONDAY, July 28 (HealthDay News) -- Researchers have discovered a soaring increase in the number of fatal medication errors that occur in people's homes.

The report incidentally follows the death earlier this year of Heath Ledger, the 28-year-old actor who died from an accidental overdose of prescription drugs in his apartment in New York City.

WEDNESDAY, July 16 (HealthDay News) -- In a feat that should help researchers more effectively evaluate new treatments for hepatitis C, investigators report that they have developed the first tissue culture of regular human liver cells that can imitate infections with the hepatitis C virus (HCV).

TUESDAY, July 1 (HealthDay News) -- A new questionnaire may help in both diagnosing older adults facing dementia and also in identifying individuals who need help with daily living.

The Everyday Cognition instrument consists of 39 questions to be answered by people who know the patient well.

MONDAY, June 30 (HealthDay News) -- A newly discovered molecular malfunction may explain the development of high blood pressure, diabetes and immune problems, researchers report.

Rogue versions of enzymes known as proteases roam the body, clipping off working segments of the receptors that allow insulin to enter cells and do its job, according to a report in the June 30 online issue of Hypertension.

That uncontrolled enzymatic activity also reduces the immune system's response to infection and raises blood pressure, the report noted.

WEDNESDAY, June 11 (HealthDay News) -- People with sleep apnea show tissue loss in brain regions that help store memory, a University of California, Los Angeles (UCLA) study shows.

"Our findings demonstrate that impaired breathing during sleep can lead to serious brain injury that disrupts memory and thinking," principal investigator Ronald Harper, a professor of neurobiology at the David Geffen School of Medicine at UCLA, said in a prepared statement.

THURSDAY, May 29 (HealthDay News) -- One glass of wine a day may not only be safe for the liver, but may actually reduce the risk of non-alcoholic fatty liver disease (NAFLD), according to a new study that challenges conventional wisdom.

The population-based study, from researchers at the University of California, San Diego, included 7,211 nondrinkers and 4,543 modest alcohol drinkers (an average of four ounces of wine, 12 ounces of beer, or one ounce of liquor per day) found that those who drank one glass of wine a day had half the risk of suspected NAFLD compared to nondrinkers.