Hyperhidrosis: This condition is characterized by excessive sweating, which can lead to body odor. The apocrine glands in the armpits are particularly prone to producing a type of sweat that, when broken down by bacteria, results in a strong odor. Hyperhidrosis is a common condition and can be exacerbated by stress, heat, or certain foods.

Bromhidrosis: This is a condition where the sweat itself has a strong, unpleasant odor. It can be due to the type of bacteria that break down the sweat or dietary factors.
Poor Hygiene: Infrequent showering or bathing, especially in warm weather, can lead to the accumulation of sweat and bacteria, resulting in body odor.
Dietary Factors: Consuming foods with strong odors, such as garlic, onions, or spicy foods, can make sweat smell worse.
Hormonal Changes: Fluctuations in hormone levels, such as those experienced during puberty, menopause, or pregnancy, can affect sweat production and body odor.

Hyperthyroidism: Although less common, an overactive thyroid gland can cause excessive sweating, which may lead to body odor. It's crucial to diagnose and treat hyperthyroidism due to its potential to cause significant health issues if left untreated.
Diabetes: Uncontrolled diabetes can lead to changes in sweat production and body chemistry, potentially resulting in stronger body odor. Early detection and management of diabetes are vital to prevent long-term complications.

Trimethylaminuria: A rare genetic disorder that affects the body's ability to break down trimethylamine, a compound found in certain foods. This leads to a strong, fish-like body odor.
Chromhidrosis: A condition where the sweat is colored, which can sometimes be perceived as having a strong odor due to the pigmentation.
Eccrine gland abnormalities: Certain conditions affecting the eccrine glands, such as eccrine gland dysplasia, can lead to abnormal sweat production and potentially body odor, though these are very rare.