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When these tubes get infected, they swell and mucous forms. Acute bronchitis is almost always caused by viruses that attack the lining of the bronchial tree and cause infection. It takes time for your body to kill the viruses and heal the damage to your bronchial tubes. The viruses that cause acute bronchitis are sprayed into the air or onto people’s hands when they cough.
You can get acute bronchitis if you breathe in those viruses or transfer them from a contaminated hand to your mouth. Because acute bronchitis is usually caused by viruses, antibiotics (medicines that kill bacteria) usually do not help. Even if you cough up mucus that is colored or thick, antibiotics probably won’t help you get better any faster. These medicines can help open the bronchial tubes and clear out mucus. They are usually given with an inhaler.
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