Bronchitis is divided into acute bronchitis and chronic bronchitis. Acute bronchitis is usually caused by viral, bacterial, and pathogenic bacterial infections such as mycoplasma and chlamydia, and has a tendency to heal itself, usually for 1-3 weeks, and is usually caused by viral infections, which have a tendency to heal themselves. In general, anti-bacterial infection treatment is not advocated for acute bronchitis, but mostly symptomatic treatment, such as expectoration and antispasmodic treatment. Some patients with acute bronchitis may develop secondary infections, and antibacterial therapy is required for secondary bacterial infections, which generally do not heal on their own and require active treatment. Chronic bronchitis is due to improper treatment of acute bronchitis, which turns into chronic bronchitis, especially in the elderly group with reduced resistance, and chronic bronchitis in this group may start to recur every autumn and winter. In conclusion, bronchitis should not be treated aggressively because it has a tendency to heal itself.