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If there is vaginal infection or if your partner is having infection, you can experience burning sensation after ejaculation of semen. Do not ignore your symptoms. Visit your doctor/gynecologist at the earliest for examination, vaginal swab/smear test to identify causative agent and get started on treatment as appropriate. Your partner should also consider getting semen analysis done to rule out chances of infection. Since you are sexually active, get your partner also treated simultaneously to prevent chances of re-infection. Drink plenty of water. Avoid vaginal douching, use of harsh soap or perfumes in the area (vagina has its own mechanism of cleaning itself. Use of these products harms the normal bacteria of vagina and it becomes susceptible to infection). Use loose cotton undergarments and avoid tight fitting clothes. Avoid having unprotected intercourse while both of you are on treatment course.
If infective causes are ruled out, chances of allergic reaction to the seminal fluid proteins should be ruled out by going ahead with further investigations.
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