15 Most Common Symptoms of Appendicitis

2. Vomiting

You may start to vomit soon after the pain begins, often after nausea and loss of appetite. It usually happens within the first day of symptoms. At first, you may feel mild stomach upset. As your appendix becomes more inflamed, vomiting can become more frequent.

Your body reacts to irritation inside your abdomen by causing vomiting. Vomiting from appendicitis does not usually bring relief. You may still feel steady pain in the lower right side of your belly. Pain that gets worse when you move, cough, or walk can point to a deeper problem.

Common features include nausea before vomiting, ongoing belly pain that does not improve after vomiting, low-grade fever with stomach upset, and loss of appetite. If your appendix bursts, vomiting may become more severe. You might also notice chills or feel very weak, which can mean the infection has spread inside your abdomen.

3. Pain in the Abdominal Region

Pain in your abdomen is often the first sign of appendicitis. You may feel it near your belly button or in the middle of your stomach. At first, the pain can feel dull or mild, and this early discomfort can seem harmless, which makes it easy to ignore.

Within hours, the pain often moves to the lower right side of your abdomen, where the appendix sits. As swelling increases, the pain usually becomes sharp and more constant. Movement can make it worse, and walking, coughing, or sudden motion may increase discomfort. Pressing on the lower right side can also cause stronger pain.

The pain often follows a clear pattern. It starts near the belly button, shifts to the lower right abdomen, becomes stronger over 12 to 24 hours, and worsens with movement or touch. Steady pain that moves and grows stronger is a warning sign that requires prompt medical evaluation.

4. Pressure

You may feel a sense of pressure in your lower right abdomen as appendicitis develops. This pressure can start as a dull feeling near your belly button. Within hours, it often shifts to the lower right side, where the appendix sits.

At first, it might not feel like a sharp pain because a blockage can keep fluid and bacteria inside the appendix, causing it to swell. As the appendix swells, it pushes against nearby tissue. This process increases pressure in the area and can reduce healthy blood flow. The growing pressure leads to discomfort that becomes harder to ignore.

You might notice the pressure feels worse when you move, cough, or take a deep breath. Even small actions such as walking or riding in a car can increase the feeling. Pressing on the lower right abdomen may cause more discomfort, and releasing your hand can briefly worsen the pain. Without treatment, rising pressure can lead to rupture and serious infection.

5. A High Fever

A high fever often appears after the stomach pain begins. Your body raises its temperature to fight the infection inside your appendix. This response shows that inflammation is getting worse. Many people first develop a mild to moderate fever, often above 100.4°F (38°C), as the condition progresses.

You may also have chills or shaking, sweating, warm and flushed skin, and a weak or tired feeling. If the appendix bursts, the fever can rise quickly, and you might feel very sick within a short time. A sudden spike in temperature with severe belly pain can signal a serious problem inside the abdomen.

Older adults may not develop a very high fever but may feel confused or unusually weak, while children may develop a higher fever faster. A fever that continues to rise, does not improve, or appears with worsening pain requires urgent medical evaluation.

6. Worsened Pain When Moving

When you have appendicitis, movement often makes your pain worse. You may notice a sharp increase in pain when you walk, stand up, or change positions in bed. Even small actions can trigger discomfort, and the pain often centers on the lower right side of your abdomen.

Coughing, sneezing, or laughing can also cause a sudden stab of pain. These actions tighten your abdominal muscles and increase pressure inside your belly. The added pressure irritates your swollen appendix and the lining of your abdomen, which leads to stronger pain.

You may try to stay very still to avoid discomfort. Some people bend forward or pull their knees up while lying down because it feels slightly better. Doctors often check for this sign during an exam because pain that worsens with movement is a common and important symptom of appendicitis.

7. The Chills

You may feel chills when your appendix becomes inflamed. Chills often happen when your body fights an infection, and they can appear with or without a high fever. You may suddenly feel cold and shaky, even in a warm room.

Shivering may be hard to control. Your teeth may chatter, and your skin may look pale or feel cool. In appendicitis, chills often appear with belly pain, nausea, or loss of appetite. As the infection worsens, your temperature may rise and trigger repeated waves of chills that leave you feeling tired.

Common features linked to chills include shaking or trembling, a sudden strong feeling of cold, sweating after the shaking stops, and a fever above the normal range. Chills alone do not confirm appendicitis, but chills with steady or increasing lower right abdominal pain raise concern for infection inside your abdomen.

8. Bloating and Gas

You may notice your abdomen feels full or tight. This bloating can make your clothes feel snug and your stomach look swollen. The pressure may build over several hours and gas may become harder to pass, which can lead to cramping or dull pain.

Appendicitis can slow your bowel movements. When your intestines move more slowly, air and waste stay inside longer, causing swelling and added discomfort. Pain may start near your belly button and seem like simple gas. As swelling in the appendix increases, the pain often shifts to the lower right side and becomes sharper.

Other changes may appear with bloating, such as loss of appetite, nausea or vomiting, low-grade fever, and pain that worsens when you walk or cough. Bloating and gas alone do not confirm appendicitis, but discomfort that increases instead of improving raises concern. A firm and very painful abdomen may signal rupture and requires emergency medical care.

9. Pain When Using the Bathroom

You may feel pain when you try to pass stool or gas. This can happen because your swollen appendix sits close to the lower intestine. As pressure builds in your abdomen, normal bathroom movements can hurt. The pain often stays on the lower right side and may become sharper when you strain.

Some people notice changes in bowel habits. You may have constipation, diarrhea, or a feeling that you cannot fully empty your bowels, and trouble passing gas is also common. Sharp lower right abdominal pain, discomfort that worsens with straining, bloating, and bowel changes are signs often linked to this symptom.

In some cases, you may feel burning or discomfort when you urinate if the inflamed appendix irritates the nearby bladder. The pain usually does not improve after using the bathroom. Pain that grows stronger over time and does not ease with rest requires prompt medical evaluation.

10. Decreased Appetite

You may notice that you do not feel like eating when appendicitis begins. This loss of appetite often starts early, sometimes before the pain moves to the lower right side of your belly. Food may seem unappealing, even at times when you would normally feel hungry. Your body reacts to infection and swelling by slowing digestion.

Because of this change, you may feel full after only a few bites. Mild nausea can also appear along with a lower desire to eat. These changes often develop as inflammation in the appendix increases. Decreased appetite may occur with pain that starts near your belly button, shifts to the lower right side, nausea or vomiting, and low-grade fever. Children and teens may refuse favorite foods when this symptom appears.

11. Diarrhea

You may notice diarrhea when your appendix becomes inflamed. This symptom does not happen in every case, but it can occur, especially when the irritated appendix sits close to the rectum. The loose stools are often mild, and the amount is usually small.

Diarrhea linked to appendicitis does not always relieve belly pain. The pain often starts near your belly button and then moves to the lower right side. If diarrhea appears along with this shifting pain, it can suggest a deeper problem rather than a simple stomach virus.

Stomach viruses also cause diarrhea, but they often bring cramping across the whole abdomen and frequent watery stools. With appendicitis, pain is more likely to stay steady and worsen over hours. Other symptoms may include loss of appetite, nausea or vomiting, low fever, and trouble passing gas.

12. Dehydration

Appendicitis can cause dehydration from vomiting, fever, or not drinking enough because you feel sick. Your body needs a steady balance of fluids to work well. When fluid levels drop, weakness and discomfort can increase.

Signs of dehydration include dry mouth and lips, strong thirst, dark yellow urine, urinating less often, weakness, and feeling lightheaded. Low fluid levels can reduce blood volume, which may cause dizziness when you stand up. Your heart may beat faster as it tries to keep blood moving through your body.

Fever raises your need for fluids, while sweating and vomiting increase fluid and salt loss. Children and older adults can become dehydrated more quickly. Warning signs such as confusion, extreme tiredness, or very little urination require urgent medical evaluation.

13. Fatigue

Fatigue is a common symptom of appendicitis. You may feel very tired even if you have not done much during the day. This heavy, drained feeling can begin early and often grows stronger as the infection in your appendix develops.

Your body uses a lot of energy to fight infection. When your appendix becomes blocked and inflamed, your immune system works hard to respond. This response can leave you feeling weak, slow, or mentally foggy. Simple tasks may take more effort than usual.

Fatigue often appears with stomach pain, loss of appetite, nausea, or a low fever. Pain in the lower right abdomen can also disturb your sleep, which adds to exhaustion. Sudden and unusual fatigue with sharp or worsening belly pain requires prompt medical evaluation.

14. Brain Fog

You may notice that your thinking feels slow or unclear, which is often called brain fog. It can make it hard to focus, remember simple things, or follow a conversation. You may feel distracted or not as sharp as usual. Appendicitis mainly causes belly pain, but infection can also affect how you feel mentally.

When your body fights a strong infection, you may feel tired, weak, and mentally drained. A rising fever can add to confusion or make you feel spaced out. Brain fog may include trouble concentrating, forgetfulness, confusion about time or place, slow thinking, and low energy. If the appendix bursts, infection can spread inside your abdomen and lead to a body-wide infection.

15. Malaise

Malaise is a general feeling that something is not right in your body. You may feel weak, tired, or run down without a clear reason. This feeling can start early in appendicitis, sometimes before strong pain develops in your abdomen.

You may notice low energy and less interest in normal activities. Simple tasks can feel harder than usual. A mild fever or slight chills may also appear as your body reacts to infection. These changes happen because your immune system is working hard to fight the swollen and infected appendix.

Malaise often appears with other symptoms such as loss of appetite, nausea or vomiting, abdominal pain that moves to the lower right side, and low-grade fever. In children and older adults, unusual tiredness, irritability, or confusion may be early signs.