Spleen pain typically shows up as a dull ache or sharp pain in the upper left side of your abdomen, just under the left ribcage. It often radiates to your left shoulder or back, and it can get noticeably worse when you take a deep breath. Depending on the cause, the sensation ranges from vague discomfort and fullness to sudden, severe pain.
Where You’ll Feel It
Your spleen sits in the upper left quadrant of your abdomen, tucked beneath your left ribcage next to your stomach. A healthy spleen is roughly the size of your fist, typically under 11 centimeters long. Because of its position, spleen pain centers in that left-side area below the ribs, not in the middle of your belly or down near your hip.
One distinctive feature of spleen pain is that it frequently travels to your left shoulder. This happens because the spleen sits near the diaphragm, the large muscle you use to breathe. When the spleen swells or bleeds, it can irritate the underside of the diaphragm, which shares nerve pathways with the left shoulder. So if you’re feeling upper left abdominal pain paired with an aching left shoulder, especially pain that worsens when you inhale deeply, the spleen is a likely source.
How It Feels With an Enlarged Spleen
An enlarged spleen, called splenomegaly, often causes surprisingly subtle symptoms at first. Many people describe it as vague abdominal discomfort rather than outright pain. You might feel a sense of pressure or heaviness under your left ribs that’s hard to pin down.
One of the most common early signs is feeling full quickly when you eat. Because the spleen sits right next to the stomach, an enlarged spleen physically presses against it, shrinking the space available for food. You may lose your appetite or feel uncomfortably stuffed after just a few bites. This early fullness is sometimes the symptom that brings people to a doctor before pain itself does.
As the spleen grows larger, the discomfort becomes more noticeable. The dull ache under the left ribs may become constant, and tenderness develops when you press on the area. Deep breathing can intensify the pain because the expanding lungs push the diaphragm down onto the swollen spleen.
Sudden, Severe Pain: Splenic Infarction
A splenic infarction occurs when blood flow to part of the spleen gets blocked, causing tissue to die. The pain profile is very different from the gradual discomfort of an enlarged spleen. It hits suddenly and severely in the upper left abdomen, and it can spread to the left shoulder. There’s no slow buildup. The onset is abrupt enough that most people can identify the exact moment it started.
What a Ruptured Spleen Feels Like
A ruptured spleen is the most dangerous scenario. It usually follows a blow to the abdomen, such as a car accident, a fall, or a hit during contact sports. The spleen is full of blood, so when it tears, internal bleeding can be life-threatening.
The pain from a rupture centers in the upper left abdomen and is tender to the touch. Left shoulder pain is common. But the more alarming symptoms come from blood loss rather than the injury itself: confusion, lightheadedness, dizziness, and feeling faint. Your skin may become pale and clammy. These signs indicate a medical emergency, and they can develop within minutes of the injury or, in some cases, be delayed by hours or even days.
People recovering from mononucleosis face a higher risk of splenic rupture because mono commonly causes the spleen to swell. The CDC recommends avoiding contact sports until you’ve fully recovered from mono, since even moderate physical strain on a swollen spleen can cause it to tear.
What Else Causes Pain in the Same Spot
The upper left quadrant of your abdomen is home to more than just the spleen. Your stomach sits there, your pancreas passes behind it, and a section of your large intestine (the transverse colon) runs along the bottom edge. Kidney problems on the left side can also radiate to this area. All of these can produce pain that feels like it could be the spleen.
A few features help distinguish spleen pain from these other sources. Stomach pain tends to relate to eating, producing burning or cramping that improves or worsens with food. Kidney pain usually wraps around to the back and flank rather than staying under the front of the ribcage. Colon pain is more commonly crampy and associated with changes in bowel habits. Spleen pain’s hallmark is that left shoulder radiation and the worsening with deep breaths, which most of these other conditions don’t produce.
That said, imaging is usually needed to confirm the spleen as the source. An ultrasound can measure spleen size precisely and detect swelling, infarction, or signs of rupture. If your pain is severe, came on suddenly, or follows an injury to the abdomen, getting evaluated quickly matters. Pain that worsens with breathing or comes with lightheadedness and shoulder pain warrants urgent attention.