What is the reason for the severe dry cough in children?

Patient's question:

Patient Age: Four and a half years old
Detailed Condition and Purpose of Consultation: The child has been coughing for several months. The cough is not severe, it's dry cough, sometimes with phlegm, occasionally with a few episodes of vomiting. When taking medication, the cough usually stops, but it starts again after half a day or a day. They have been to the hospital, and some doctors said it's allergic cough, while others said it's poor immunity. They were prescribed medication, but it had the same effect. I'm worried that the child is taking so many medications for so long. What should I do now? Please ask the expert doctor for a diagnosis and guidance! Thank you.
History of Previous Diagnoses and Treatments and Their Effects: X-ray examination was conducted, showing no abnormalities, with increased texture.

Doctor's answer:

Suggestion: Let the child pay attention to rest, drink more water, eat more vegetables and fruits to promote the excretion of toxins in the body. Oral Cough Sensitizer treatment is effective, can be taken orally, and observation is needed. If necessary, atomization can be performed.

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