What is the reason of bitter taste of my mouth.sometimes bitter taste feels on upper soft palate of mouth but often on tongue and also bitter saliva. I have been suffering from gastric trouble for last two months and continuous burping normal burps without any taste in it and also suffering from cold allergy and stuffy nose with post nasal drip since March 2020.Is there any link between allergy and excess gas formation and bitter taste of my mouth? I am very confused what is the main reason behind my bitter taste of mouth. cbc crp and Lft test report is normal. These all above things hamper my daily activities