Why does the child have a long-term cough

Patient's question:

Age
Detailed medical condition and consultation purpose: Coughing for over a month, with medication not showing improvement. Unsure of the cause of the cough or what medicine would work.
Duration of the current illness: Over a month.
Current general condition: Coughing starts after waking up in the morning, with no issues in the afternoon or evening. Dry coughing also occurs after exercise or laughter.
Medical history: Allergic rhinitis for six months, with occasional nose and eye itching. Currently using nasal spray.
Previous diagnoses, treatments, and outcomes: Seen by an otolaryngologist, diagnosed with rhinitis, and undergoing allergy treatment

Doctor's answer:

Hello:
Coughing is a reaction to irritation in the throat, respiratory tract, or lungs. Coughing in infants under 6 months old is often a serious condition and requires immediate medical attention. If a child suddenly starts coughing violently, it may be possible that food has been inhaled into the lungs or that other foreign objects (such as small toys) have entered the respiratory tract. If a child has a cough accompanied by abnormal breathing, seek medical attention immediately. In severe cases, the child should be taken to the emergency room.
1、Symptom: Coughing in infants (under 6 months old).
Possible: Bronchitis.
Treatment: It is best to go to the hospital immediately. Antibiotics may be used for treatment, and it is likely that oxygen will be needed to help the infant breathe.
2、Symptom: Coughing is worse at night than during the day, occurring in fits, with coughing spells of dozens of coughs without intervals, sometimes making it difficult to breathe. When the coughing stops, a special echo is heard, like whistling. It may also cause vomiting, without fever, or with fever.
Possible: Whooping cough, which usually lasts for two months or more on average.
Treatment: See a doctor. After the doctor diagnoses whooping cough, antibiotics will be used to improve the condition and prevent bacterial infections.
Whooping cough is one of the common infectious diseases in children. There is no specific treatment for it. Cough suppressants should not be forced. After coughing and vomiting, give the child easily digestible food. Pay attention to keeping the indoor air fresh, warm, and avoiding smoke and dust irritation.