My older brother keeps on coughing to much?

It's been going on for 6 days now. I don't know what's going on with him. He's been coughing constantly on the regular basis, day in day out. I'm worried. I don't wanna say that is something serious, but it's something that is making him cough and it's not going away. He can't... show more It's been going on for 6 days now. I don't know what's going on with him. He's been coughing constantly on the regular basis, day in day out. I'm worried. I don't wanna say that is something serious, but it's something that is making him cough and it's not going away. He can't seem to stop coughing. Should he go see the doctor? Please I need some help
Update: He's not a smoker or a alcohol drinker, in case everyone is wondering.
Update 2: He's been taking medicines for his cough, but nothing seems to be benefiting him. It's most likely he should see a doctor.
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