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U.S. doctors write enough prescriptions each year to provide antibiotics to 4 out of 5 Americans, a new study shows. That’s so many that the drugs probably are being overused, experts told the Associated Press (AP). Excess use helps bacteria to become resistant to the drugs. The new study used a national drug database. Numbers come from 2010. In that year, health care professionals wrote 258 million prescriptions for antibiotics. The population was about 309 million. That’s about 833 prescriptions for every 1,000 people. But the numbers varied greatly from state to state. West Virginia, Kentucky and Tennessee had the highest rates. About 1,200 prescriptions were written for every 1,000 people in those states. In Alaska, Oregon and California, the numbers were 600 or below. Experts said Southern states may have more infections than other states.

Researchers say they have found a way to “see” one type of pain on a brain scan. In the future, such an approach may help to tell whether babies or others who can’t communicate well are feeling pain. The study included 114 healthy volunteers. They were hooked up to a functional MRI (fMRI) machine to show activity in different parts of the brain. First, people were tested using a heating element applied to the forearm. Sometimes the heat was painful but not burning (116 degrees Fahrenheit). Other times it was just warm. Researchers saw a “pain signature” in the fMRI pattern for painful heat, compared with warmth. More than 90% of the time, these patterns matched what people said about whether they felt pain. Researchers also looked at “social pain.” Of those in the study, 40 recently had a romantic breakup. They were shown photographs of the partners who had dumped them.