What you are referring to is known as hematospermia. The following is taken from UptoDate:
The most
commonCommon cold cause of hematospermia is prostate biopsy. Hematospermia lasts more than several days in one-half of men who undergo the procedure.
A variety of conditions other than prostate biopsy have been reported in patients with hematospermia. They include
benignBenign ear cyst or tumor
Benign positional vertigo and
malignantCancer
Gestational trophoblastic disease
Lymphoma, malignant - ct scan
Malignant melanoma
Malignant otitis externa
Melanoma of the eye
Multiple myeloma
Skin cancer, malignant melanoma disordersAdjustment disorder
Anorexia nervosa
Asperger syndrome
Autism
Autoimmune disorders
Bipolar disorder
Bipolar disorder
Bleeding disorders
Borderline personality disorder
Bulimia
Chronic motor tic disorder of the prostate gland, seminal
vesiclesVesicles, spermatic cord, and ejaculatory duct system; urogenital infections;
metastaticMetastatic brain tumor
Metastatic cancer to the lung cancers; and vascular disorders. However, it is often impossible to know with certainty whether these conditions are the cause of hematospermia. The cause is idiopathic in a substantial proportion of patients, and the condition frequently resolves spontaneously.
Transrectal ultrasound is the imaging procedure of choice for patients with hematospermia. It can identify structural abnormalities of the prostate gland, seminal vesicles, and spermatic cord, and guide biopsies if any suspicious abnormalities are identified in those organs. Transrectal ultrasound should be obtained as part of the evaluation of hematospermia in men 35 years of age, or when hematospermia persists for more than one month.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.
Bibliography:
Weiss et al. Hematospermia. UptoDate, 2003.