Wrist Extensor Tendinopathy: This condition, often related to overuse or repetitive strain, is a common cause of dorsal wrist pain, especially when exacerbated by activities like pushups that involve wrist extension.

Ganglion Cyst: A common benign lump that can cause pain and discomfort on the dorsal aspect of the wrist, especially if it compresses nearby nerves or tendons.
Wrist Sprain: An injury to the ligaments surrounding the wrist joint can cause pain, especially on the dorsal side, and may be exacerbated by activities that put stress on these ligaments.
Intersection Syndrome: This condition, characterized by inflammation of the tendons on the dorsal aspect of the wrist, can cause pain and swelling, particularly with activities that involve wrist extension.

Scaphoid Fracture: Although less common, a fracture of the scaphoid bone in the wrist can cause dorsal wrist pain and must be considered, especially if there's a history of trauma, as missing this diagnosis can lead to complications like nonunion or avascular necrosis.
Osteonecrosis of the Lunate (Kienböck's Disease): A rare condition where the blood supply to the lunate bone is disrupted, leading to its necrosis, which can cause chronic wrist pain.
Infectious or Inflammatory Arthritis: Conditions like septic arthritis or rheumatoid arthritis can cause wrist pain and must be considered, especially if there are systemic symptoms or signs of infection.

Gout or Pseudogout: Deposition of urate or pyrophosphate crystals within the wrist joint can cause acute or chronic pain and should be considered, especially in patients with a history of these conditions.
Tumor (Benign or Malignant): Although rare, tumors of the wrist can cause chronic pain and should be considered if other diagnoses are ruled out and pain persists.
Nerve Entrapment Syndromes: Conditions like radial nerve compression can cause pain and other symptoms on the dorsal aspect of the wrist and hand.