Foreign body in nasal cavity: because children are young and curious, they may pinch some small things in their noses when playing, but they can't take them out. They didn't tell their parents in time. If it goes on for a long time, these things will cause inflammation of nasal mucosa, and finally there will be purulent nasal discharge.

② Atrophic rhinitis: The patients with atrophic rhinitis are mainly young people. Under normal circumstances, patients with this disease can't smell the bad smell, but others can't stand it and often leave. Some patients with poor sense of smell can smell the disease from far away.

③ Malignant tumor: more common in middle-aged and elderly people. These people not only have a bad smell in their noses, but also have a bad smell. Symptoms such as bleeding and headache. Therefore, if there is no obvious reason for middle-aged and elderly people, it is limited to the smell in the nasal cavity, which is often caused by malignant diseases. Everyone must go to the hospital for a detailed examination.

④ Osteomyelitis: Osteomyelitis of frontal bone and ethmoid sinusitis will be accompanied by bad smell when they discharge pus, and sometimes they will be mistaken for nasal odor.

⑤ Cheese rhinitis: Tofu-like dirt is mixed in the nasal cavity, resulting in foul smell.

In order to improve this phenomenon, we should first protect our nasal mucosa, pay attention to the hygiene of the nose, wash the nose frequently and massage properly when cleaning, which can also improve blood circulation and reduce the chance of catching a cold. Also, be gentle when picking nose excrement, and never touch your nose with dirty hands.

If the nostrils always stink, then everyone should be careful. If there is anything else in the nasal cavity, then we can take it out. If it is atrophic rhinitis or osteomyelitis, then some measures need to be taken to treat it, because the trouble is malignant tumors, especially middle-aged and elderly people. If this happens, we must not be careless.