I've had the hiccups for days what can i do to stop them and is it bad?

R/o underlying cause: Hiccups are involuntary sounds made by spasms of the diaphragm. They usually resolve by themselves after a few minutes. Prolonged hiccups that last for days or weeks may indicate an underlying disorder which needs investigation.Esophagitis hyperthyroidism, pleurisy (inflammation of the membrane surrounding the lungs), pneumonia, kidney disease, brain damage, chest surgery stop underlying cause.