Summary— The cause of haemospermia was determined in 70 (86%) of 81 patients. Inflammatory lesions accounted for the bleeding in most men under 30 years of age. Neoplasia (61, trauma (3) and amyloidosis (2) of the seminal vesicle were diagnosed in the other patients. Persistent haemospermia should always be investigated since clinically unsuspected tumours may be the source of bleeding in the older age groups. Analysis of the semen, prostatic fluid and urine should be performed initially. Cystourethroscopy should then be carried out if the initial investigations are negative and, if this too is negative, vasography is indicated.