The old man discharged semen is very thick rarely, clinically possible reasons are chronic prostatitis, ejaculation is too frequent, may also be the normal physiological function degradation. 1. chronic prostatitis: this situation is usually associated with the prostate by pathogenic bacteria infection, which will stimulate the prostate, urethra and other parts of the mucous membrane edema, erosion, and the prostate secretion of protein hydrolysis enzyme, fibrinase will appear to reduce the situation, the liquefaction of semen will be affected by the semen becomes viscous, ejaculation volume will also be reduced. 2. Too frequent ejaculation: If some elderly people have too frequent sex or masturbate excessively, it may also lead to the emergence of semen becoming sticky and ejaculation volume is reduced. 3. Normal physiological function deterioration: with age, testicular function will deteriorate, sperm production will be reduced and make the semen production reduced and become sticky. There are many reasons why the old man’s semen is very thick and very little, it may also be seminal vesiculitis, etc. It is recommended to go to the hospital for examination to carry out targeted treatment.