Urinary Tract Infection (UTI): This is a common cause of sudden onset incontinence, especially in young men. Bacterial infection can irritate the bladder, leading to urgency and incontinence.

Overactive Bladder: Characterized by a sudden, intense urge to urinate, which can lead to incontinence if the individual cannot reach the bathroom in time.
Stress Incontinence: Although more common in women, young men can experience stress incontinence due to increased abdominal pressure (e.g., from coughing, sneezing, or heavy lifting), which can weaken the pelvic floor muscles.
Neurogenic Bladder: Conditions affecting the brain, spinal cord, or nerves can disrupt normal bladder control, leading to incontinence. This could be due to a variety of causes, including diabetes, spinal cord injuries, or multiple sclerosis.

Spinal Cord Injury or Compression: Any condition that suddenly affects the spinal cord (e.g., trauma, herniated disk, tumor) can lead to incontinence. Early diagnosis is crucial for preserving neurological function.
Cauda Equina Syndrome: A serious condition where the nerves in the spinal canal are compressed, leading to loss of bladder and bowel control, among other symptoms. Prompt surgical intervention is often necessary.
Stroke or Transient Ischemic Attack (TIA): Although less common in young men, a stroke or TIA can cause sudden onset of incontinence due to brain injury affecting bladder control areas.

Multiple Sclerosis: An autoimmune disease that can affect the central nervous system, leading to a wide range of symptoms, including bladder dysfunction and incontinence.
Tumors of the Brain or Spinal Cord: Rarely, tumors in these areas can compress or invade areas responsible for bladder control, leading to incontinence.
Inherited Neurological Disorders: Certain genetic conditions, such as spina bifida or familial spastic paraplegia, can affect bladder control, though these would typically present earlier in life.