A 17-year-old boy in Mexico City has died after reportedly receiving a hickey from his 24-year-old girlfriend. According to physicians, the hickey suction likely caused a blood clot that traveled to his brain, resulting in a deadly stroke. It's rare for a hickey to cause a stroke but it does happen. From WWMT:
In a 2010 case… reported in a New Zealand Medical Journal where a 44-year-old woman was rushed to the hospital after losing movement in her arm due to a hickey on her neck, Doctors weren't sure why the woman was having a stroke, but then noticed a bruise on her neck and realized the suction on a major artery created a blood clot. According to an interview with the doctor who treated the woman, Dr Teddy Whu, the clot was in the "artery underneath where the hickey was" (and the clot traveled to the woman's heart.)