Semi prod. Cough with wheezing. Clear phlegm. No nasal cong. No fever. Ongoing for a week. No hist. Of asthma. What could it be? Should I be worried?

Bronchospasm... It sounds like you have bronchospasm. There are many possible causes, asthma being only 1 of them. By definition, asthma is recurrent so if this is the first time wheezing, asthma cannot be diagnosed yet. See your doctor to find out why you have bronchospasm and to treat it. See a lung doctor if your symptoms continue or if no etiology is identified. Good luck!