Foot odor is caused by a fungal infection of the skin, and patients may get foot odor by touching shoes or socks that have foot odor. Smelling foot odor theoretically leads to the risk of lung infection. Lung infections are mainly caused by pathogens entering the respiratory tract through droplets and aerosols. When smelling foot odor, aerosols and dander formed by pathogens such as fungi on the feet may enter the lungs through the airways, which may lead to fungal infections in the lungs, etc. if the body has poor resistance. Patients who develop infections in the lungs will have symptoms such as coughing, fever, and coughing up sputum. Therefore, when foot odor appears, you need to go to a dermatologist for treatment and avoid the bad habit of smelling foot odor.