Muscle Strain: This is often the most common cause of groin pain, especially in individuals who participate in sports that involve sudden stops, changes in direction, and kicking, such as soccer or football. The pain is typically localized to the groin area and can be exacerbated by movement.

Inguinal Hernia: An inguinal hernia occurs when tissue, such as part of the intestine, protrudes through a weak spot in the abdominal muscles. The hernia can cause pain, especially when coughing, lifting, or bending over, and is more common in men.
Osteitis Pubis: This condition involves inflammation of the pubic bone and surrounding structures, often seen in athletes involved in sports that require repetitive kicking. The pain is usually localized to the pubic area and can radiate to the groin.
Adductor Tendinopathy: This condition involves inflammation of the tendons of the adductor muscles, which are located in the thigh and help to bring the legs together. It is common in athletes who participate in sports that involve running, kicking, or quick changes of direction.

Testicular Torsion: Although more commonly associated with acute testicular pain, testicular torsion can sometimes present with groin pain. It is a medical emergency that requires immediate attention to preserve the testicle.
Appendicitis: In some cases, especially if the appendix is located in a retrocecal position, appendicitis can present with right groin pain rather than the more typical right lower quadrant pain.
Kidney Stone: A stone passing down the ureter can cause severe pain that may radiate to the groin area. The pain is often colicky in nature, meaning it comes and goes in waves.

Avascular Necrosis of the Femoral Head: This condition involves the death of bone tissue due to a lack of blood supply and can cause groin pain, especially with weight-bearing activities. It is more common in individuals with certain risk factors, such as long-term steroid use.
Psoas Abscess: An abscess of the psoas muscle can cause groin pain, fever, and difficulty walking. It is a rare condition that often occurs in the context of underlying diseases like spinal infections or Crohn's disease.
Sportsman's Hernia (Gilmore's Groin): This condition involves a spectrum of injuries to the groin, including tears of the external oblique aponeurosis and inguinal ligament. It is seen in athletes and can cause chronic groin pain.