Welcome to HealthcareMagic. Hiccups, occasional are usually self limiting.But if you feel, they have been there for quite some time, then they probably need to be evaluated.The causes are varied like central nervous system
causes congenital malformations,malignancies, multiple sclerosis
,infection, trauma, some vascular lesions.Some may be psychogenic in origin like hysteria, fear,some personality disorders.It could be irritation of diaphragm(main muscle of breathing) like Hiatal hernia, a subphrenic abscess
.Some metabolic causes like less pottasium/sodium/calcium..So consult a primary care
physician and get it diagnosed.Take care.