Gallstones Explained: Why They Form and When Surgery Is Needed

Gallstones are one of the most common digestive problems in Australia, often discovered during scans for abdominal pain or nausea. While some people never experience symptoms, others can develop painful attacks that interfere with daily life. Understanding why gallstones form and when surgery is needed can help you make informed decisions about treatment.

What are gallstones?

Gallstones are solid lumps that form in the gallbladder, a small organ beneath the liver that stores bile, which helps digest fats. These stones can range in size from tiny grains to several centimetres and are usually made up of cholesterol or pigment (bile components).

Why gallstones form

Bile is a fluid made up of water, bile salts, cholesterol and other substances. Gallstones form when the balance of these substances is disrupted. Common reasons include:

• Too much cholesterol in bile – when bile contains more cholesterol than it can dissolve, crystals form and gradually harden into stones.
• Incomplete gallbladder emptying – if the gallbladder doesn’t fully empty, bile becomes concentrated, encouraging stone formation.
• Changes in bile composition – hormonal changes, weight loss, certain medications, or liver disease can alter how bile is produced or stored.

Risk factors include being female, over 40, overweight, or having a family history of gallstones. Rapid weight loss and certain diets can also contribute.

When gallstones cause problems

Many people with gallstones have no symptoms and don’t need treatment. However, when a stone blocks the bile duct, it can cause:

• Sudden, severe pain in the upper right or middle abdomen (biliary colic)
• Nausea or vomiting
• Pain after eating fatty foods
• Jaundice (yellowing of the skin or eyes) if a bile duct is obstructed
• Fever or chills, which may indicate infection

These symptoms often come in waves but can worsen over time. Once gallstones become symptomatic, surgery is usually recommended to prevent further attacks or complications.

When surgery is needed

The most effective treatment for symptomatic gallstones is laparoscopic cholecystectomy (removal of the gallbladder). This minimally invasive surgery is safe, common, and allows most patients to return home the same day. Without surgery, gallstones can continue to cause pain or lead to serious conditions like gallbladder infection, inflammation of the pancreas, or bile duct obstruction.

Gallstones form when the chemical balance of bile is disrupted, leading to hardened deposits that can cause pain or complications. While harmless in some people, symptomatic gallstones usually require surgical removal. With modern minimally invasive techniques, recovery is fast and long-term outcomes are excellent.