Does the absence of odor after a shower indicate that it's not axillary osmidrosis (underarm odor)?

Generally speaking, if the odor disappears after a shower, it is more likely to be physiological body odor rather than bromhidrosis (commonly known as狐臭 or axillary osmidrosis). If it is bromhidrosis, the odor may only be temporarily reduced after showering and will soon reappear along with sweat secretion. If you have any concerns, it is recommended to seek medical advice in advance. Detailed analysis is as follows:

Physiological body odor is often caused by exercise or heat-induced sweating in the armpits. When sweat is broken down by bacteria, it produces an odor. This kind of odor is relatively mild and remains on the skin surface or clothing. It can be completely eliminated by washing the skin and changing clothes. Once sweat secretion stops, the odor won't reappear and generally has little impact on daily social interactions.

Bromhidrosis is caused by abnormal sweat secretions from the apocrine glands in the armpits. This sweat contains specific components that, when broken down by bacteria, produce a strong and persistent odor. Even after washing, the odor can only be temporarily removed. Once the apocrine glands secrete sweat again, the odor quickly returns, especially after emotional stress or mild physical activity, when the odor appears faster and spreads farther, often causing social discomfort.

It is important to observe the recurrence time and intensity of the odor after showering in daily life. If the odor frequently and quickly reappears and affects your quality of life, you should promptly visit a reputable medical facility for a definitive diagnosis. Avoid improper self-treatment based on self-diagnosis, and maintain dry underarms to reduce the chance of bacterial growth.