Gallbladder Disease: The most common cause of right hypochondriac pain is gallbladder disease, including cholecystitis or cholelithiasis. The pain is often sharp and may radiate to the right shoulder.

Peptic Ulcer Disease: Peptic ulcers can cause pain in the right hypochondriac region, especially if the ulcer is located in the duodenum.
Hepatitis: Inflammation of the liver can cause right hypochondriac pain, and it may be accompanied by jaundice and other systemic symptoms.
Right Lower Lobe Pneumonia: Pneumonia affecting the right lower lobe of the lung can cause referred pain to the right hypochondriac region.
Intercostal Muscle Strain: Strain of the intercostal muscles can cause pain in the right hypochondriac region, especially if the strain occurs in the muscles between the 6th to 9th ribs.

Myocardial Infarction: Although less common, myocardial infarction can present with pain in the right hypochondriac region, especially if the inferior wall of the heart is involved.
Pulmonary Embolism: A pulmonary embolism can cause sudden onset of right hypochondriac pain, especially if the embolism is located in the right lower lobe.
Hepatic Abscess: A hepatic abscess can cause severe right hypochondriac pain and is a medical emergency.
Cholangitis: Inflammation of the bile ducts can cause severe right hypochondriac pain and is a medical emergency.

Hepatocellular Carcinoma: A rare cause of right hypochondriac pain, hepatocellular carcinoma can cause pain in the right upper quadrant.
Right Diaphragmatic Hernia: A rare condition where the diaphragm is herniated, causing abdominal contents to protrude into the thoracic cavity, can cause right hypochondriac pain.
Intrahepatic Duct Stones: Stones in the intrahepatic ducts can cause recurrent right hypochondriac pain.
Sickle Cell Disease: Sickle cell disease can cause episodes of right hypochondriac pain due to sickling of red blood cells in the liver and spleen.