After sex, stinging pain in urine is a urinary tract infection. In this case, it is recommended to drink more water, urinate more and take anti-inflammatory drugs, which can effectively improve. Anti-inflammatory drugs recommended to eat levofloxacin 0.2 grams, 2 times a day orally. You can eat sodium bicarbonate, 0.5 grams each time, 3 times a day orally, which can alkalize the urine and relieve pain. As the urethra of women is relatively short, the urethra is close to the vagina and there is sexual intercourse, resulting in women being particularly prone to urinary tract infections. It is recommended to pay attention to hygiene before and after sexual intercourse, and you should urinate once after sexual intercourse to effectively reduce bacterial retrograde infection leading to urethritis, resulting in pain after sexual intercourse.