Hematuria due to Urinary Tract Infection (UTI): This is a common condition where bacteria infect the urinary tract, leading to symptoms such as painful urination, frequent urination, and sometimes blood in the urine, which can cause a brownish color, especially at the end of urination.

Kidney Stones: Stones in the urinary tract can cause bleeding, leading to hematuria. The blood may be more noticeable at the end of urination, giving the urine a brownish tint.
Prostate Issues (e.g., Prostatitis, Benign Prostatic Hyperplasia): Conditions affecting the prostate can lead to urinary symptoms, including changes in urine color due to blood or other substances.
Dehydration: Inadequate fluid intake can concentrate the urine, making it darker. While not typically brownish, severe dehydration could potentially lead to a darker urine color.

Bladder or Kidney Cancer: Although less common, these cancers can cause hematuria, which might be noticed as a brownish color at the end of urination. Early detection is crucial for effective treatment.
Sickle Cell Disease or Trait: These conditions can lead to hematuria due to sickling of red blood cells in the kidneys. It's a critical diagnosis not to miss due to its implications for management and potential complications.

Porphyria: A group of disorders that can lead to the accumulation of porphyrins, which may cause urine to turn dark or brown, especially after exposure to sunlight.
Alkaptonuria: A rare genetic disorder that affects the breakdown of certain amino acids, leading to the accumulation of homogentisic acid, which can cause urine to turn dark or brown upon standing.
Melanuria: The presence of melanin in the urine, which can be a sign of melanoma. While extremely rare, it's a diagnosis that would have significant implications for patient care.