Hello my boyfriend has been coughing really bad and puking up a clear liquid for the past few weeks what could be wrong?

Possible LERD: Exposure of the vocal cords to stomach acid & pepsin will result in inflammation of the vocal cords (as is also often seen with acid regurgitation) = lerd. Acute laryngitis may result, but watch out for chronic hoarseness, throat clearing, airway spasms, cough, bronchitis, an asthma-type presentation, & even a higher risk of throat cancer. May however not be reflux so please get him checked.

Possibilities...: It depends on how long he has been coughing but in general possibilities include bronchospasm, post-nasal drip, gerd or a combination of these diagnoses. Acute bronchitis can be the diagnosis if the cough is present for a few days to a week or 2. If he smokes, he needs to quit to decrease inflammation. His doctor can help make diagnosis and w/smoking cessation, if needed so get him to see his doc.