My son is 2 years old he has stuffy and tuning nose sneezing for 3 tweaks whent to doc a weak ago. say lungs okay. still has stuffy and running nose?

Check house allergen: It could be an allergen in or around the house: from pets to dust to grass etc----that may be a triggering factor. Generally speaking, when a doctor says that 'lung is okay', it means that a person is not wheezing and does not have signs of pneumonia. If you can find the offending allergen and remove it, your sons symptoms may go away.