A deviated septum can cause symptoms such as nasal congestion, nosebleeds, and headaches. In addition to the aggravation of the above symptoms, untreated deviated septum can also lead to sinusitis, sleep apnea syndrome, hyposmia and so on. 1. Nasal congestion: mostly persistent nasal congestion, such as one side of the deviation for unilateral nasal congestion, the opposite side of the inferior turbinate compensatory hyperplasia and hypertrophy, bilateral nasal congestion; S-type deviation for bilateral nasal congestion. 2. Nosebleed: the surface mucosa of the protruding place of deviation (such as spine or ridge) is thin, and it is easy to be irritated by the inhalation of airflow and bleed from the mucosal erosion. 3. Headache: deviated septum can cause reflex headache when it presses on the inferior turbinate or middle turbinate; in addition, prolonged nasal congestion can lead to breathlessness and lack of oxygen, which can also lead to headache. 4. Sinusitis: the deviated part in the middle turbinate and the middle nasal passage corresponds to the middle turbinate, compression of the middle turbinate outward, mucous membrane hypertrophy of the middle nasal passage narrowing, impeding sinus drainage can induce sinusitis. 5. Sleep apnea syndrome: deviated nasal septum is one of the causes of sleep apnea syndrome, snoring, daytime sleepiness, elevated blood pressure and other symptoms, affecting sleep and quality of life. 6. Decreased sense of smell: Nasal congestion is a typical symptom of deviated septum. If deviated septum is left untreated, nasal congestion for a long time will affect the sense of smell and lead to decreased sense of smell. Prolonged septal deviation without treatment can seriously affect the quality of life, you should consult a doctor in time, under the advice of the doctor to make the appropriate treatment, so as to avoid delaying the condition.