US President Donald Trump is suffering from a chronic vein condition, the White House announced on Thursday, after days of speculation regarding photographs showing bruising on the president's hand.

After recently experiencing swelling in his legs, Trump underwent a "comprehensive exam" including a diagnostic vascular study, according to White House Press Secretary Karoline Leavitt.

Leavitt said Trump's bruised hand was consistent with "tissue damage from frequent handshaking" while taking aspirin, which she said is "part of a standard cardiovascular prevention regimen".

Trump, 79, has regularly touted his good health and once described himself as "the healthiest president that's ever lived".

The vein condition discovered in the recent exam is called chronic venous insufficiency, which occurs when leg veins fail to pump blood to the heart, causing it to pool in the lower limbs, which can then become swollen.

Leavitt said that there was "no evidence of deep vein thrombosis or arterial disease" and that all results from the test were "within normal limits".

According to a note from White House physician Sean Barbabella released to reporters, the condition is "benign and common", especially in people over age 70.

Additional testing showed "no signs of heart failure, renal impairment, or systemic illness" in Trump, Barbabella said in the note, which confirmed the information from Leavitt's earlier briefing.

Overall, Trump is in "excellent health", the doctor wrote.

Photographers captured what appeared to be Trump's swollen legs during the Fifa Club World Cup final in New Jersey on 13 July, with subsequent photos taken earlier this week showing his bruised hands during a meet with Bahraini Prime Minister Salman bin Hamad bin Isa Al Khalifa at the White House.

A bruised hand on the president had previously been photographed during a meeting with French President Emmanuel Macron in February.

The swollen legs and bruising prompted online speculation and rumours that the president may have been experiencing an illness that hadn't been made public.

Following an annual physical exam in April, Barbabella wrote that Trump "exhibits cognitive and physical health".

Trump was 78 years and seven months old when he was sworn in for his second term in January, making him the oldest president to ever be inaugurated as US leader.