Diabetes Mellitus: This condition is a common cause of retrograde ejaculation due to autonomic neuropathy affecting the bladder neck and seminal vesicles, leading to incomplete closure of the bladder neck during ejaculation.

Benign Prostatic Hyperplasia (BPH): Enlargement of the prostate can lead to bladder neck obstruction or damage, resulting in retrograde ejaculation.
Medications: Certain medications such as alpha-blockers, anticholinergics, and some antidepressants can cause retrograde ejaculation as a side effect.
Surgery: Previous surgeries like transurethral resection of the prostate (TURP), prostatectomy, or bladder neck surgery can damage the bladder neck, leading to retrograde ejaculation.
Neurological Disorders: Conditions like multiple sclerosis, Parkinson's disease, or spinal cord injuries can affect the autonomic nervous system, leading to retrograde ejaculation.

Diabetic Neuropathy with Urinary Retention: Although diabetes is the most likely diagnosis, it's crucial to identify and manage urinary retention, which can lead to more severe complications like urinary tract infections or kidney damage.
Prostate Cancer: While less common, prostate cancer can cause retrograde ejaculation, especially if it involves the bladder neck or seminal vesicles. Early detection is critical for effective treatment.

Young's Syndrome: A rare condition characterized by obstructive azoospermia, chronic sinopulmonary infections, and normal sweat gland function. It can lead to retrograde ejaculation due to the obstruction.
Ejaculatory Duct Obstruction: A congenital or acquired condition where the ejaculatory ducts are blocked, preventing semen from exiting the body normally.
Bladder Neck Contracture: A rare condition where the bladder neck becomes scarred and narrowed, potentially causing retrograde ejaculation.
Amyloidosis: A condition where abnormal proteins (amyloid) accumulate in various organs, including the bladder and prostate, potentially leading to retrograde ejaculation.