This scent may become more noticeable after strenuous exercise or a high-protein meal. If the ammonia-like odor continues, it’s important to get checked through blood tests and kidney function evaluations.

Sour or vinegar-like odor

If your sweat smells tangy, like vinegar, it could be linked to hormonal changes such as those during puberty, menstruation, or menopause.

It can also be a sign of poorly managed diabetes. When glucose isn’t used properly by the body, fat becomes the main energy source. This process produces byproducts like acetone, which can be excreted through breath and skin. While acetone is typically described as fruity, it may occasionally resemble a vinegary odor.

Excessive sweating, or hyperhidrosis, may also make the scent more intense.

Musty smell

A stale, musty body odor could be a sign of liver dysfunction. This condition, known as fetor hepaticus, results from a buildup of dimethyl sulfide that is released through the breath and skin. It’s often associated with advanced liver disease, such as cirrhosis.

As the liver struggles to filter out toxins, they accumulate in the bloodstream and are expelled through exhalation and sweat. Other warning signs may include yellowing of the skin (jaundice), abdominal bloating, and chronic fatigue. Spotting this unusual scent can help lead to earlier diagnosis. Treatment typically focuses on preserving liver function and preventing further damage through medication and lifestyle changes.

Sweet or maple syrup-like smell

A scent reminiscent of maple syrup could be linked to a rare metabolic disorder called Maple Syrup Urine Disease (MSUD). In people with MSUD, the body cannot properly process certain amino acids, leading to a buildup of toxins that carry a sweet, syrupy aroma.

Although it’s usually diagnosed in infancy, milder cases can sometimes emerge later in life. MSUD is genetic and can be life-threatening if not properly managed.

Signs can include lethargy, feeding difficulties, and even seizures. Managing MSUD requires strict dietary control. If a sweet odor is present along with any neurological symptoms, it’s important to seek testing.

Final thoughts

Our bodies are constantly sending signals, and body odor is one of the many subtle ways it communicates with us. While often overlooked, changes in natural scent can offer important clues about what’s going on internally.

Similarly, headaches—commonly brushed off as routine—can sometimes point to deeper issues. According to health experts, a new type of headache risk may even emerge after age 50.