Alcohol can cause hiccups because it irritates the stomach and esophagus , can trigger the vagus and phrenic nerves , and may also make the stomach expand more quickly, especially with carbonated drinks. That irritation can throw off the diaphragm’s normal rhythm and cause the involuntary spasms that produce hiccups.

Why it happens

  • Alcohol can inflame the lining of the digestive tract, which can stimulate nerves involved in the hiccup reflex.
  • Beer, champagne, and other fizzy drinks add gas to the stomach, increasing pressure against the diaphragm.
  • Drinking quickly or heavily can make these effects more noticeable.
  • In some people, alcohol may also worsen acid reflux, which can further irritate the area and set off hiccups.

What it means

Hiccups after drinking are usually harmless and temporary. They’re more likely when someone drinks fast, mixes alcohol with carbonation, or already has a sensitive stomach. If hiccups are frequent, severe, or last a long time, that can sometimes point to a broader irritation or reflux issue rather than alcohol alone.

Simple ways to reduce them

  • Sip slowly instead of gulping.
  • Avoid mixing alcohol with a lot of carbonation.
  • Pause between drinks.
  • Stay upright for a while after drinking.
  • Eat something first if your stomach is empty.

TL;DR: Alcohol causes hiccups mainly by irritating the digestive tract and triggering the nerve reflex that controls the diaphragm, with carbonation and fast drinking making it more likely.