Hi welcome to HCM... Yes gastritis can lead sometime reflux and so throat irritation can be there ..... So first take treatment for gastritis like omeprazole on empty stomach before meal for two week ... Drink lots of fluid. .. Avoid gastric irritants like ...... -excess tea , coffe -meat -excess fried food -smoking etc ..... Cooked oatmeal good for soothing stomach ..... If still no improvement than endoscopy done and biopsy taken and send for histopathological examination to rule out myeloma metastasis, esophagitis , crohns disease etc.... Hope i have solved your concern... Take care ...