Queen Elizabeth II is back at work in London after her holiday at Balmoral Castle in Scotland. Despite her age, the monarch is actively participating and performing her duties as the leader of the Commonwealth. But, at the age of 93, how is her health today?

Queen Elizabeth has a busy schedule for the next few weeks. Her work began with a visit to one of her patronages. She opened the new Centenary Development at the Haig Housing Trust, which would help providing housing for veterans and ex-service community.

The Queen wore her traditional bright-colored clothes so that people could easily see her in large crowds. She donned a sky blue coat paired with a wide-brimmed hat with green feathers, People noted.

From her looks, Queen Elizabeth seems to be well-rested from her summer vacation. She looks glowing, although she also looks thinner today. Her neck is now longer, and her skin is looser, which may be a result of her age.

Despite that, Prince Philip's wife remains healthy. She is particular with the food she eats and maintains a fit figure. However, she is already feeling age-related illness. She even told a friend her knees were already playing up. After her knee operation in 2003, Queen Elizabeth seems to be complaining about it again, starting last year.

According to Express, Queen Elizabeth refused to undergo another operation as she will be forced to take some time off. But, a medical expert warned the monarch that her symptoms might turn worse if she just ignored it. Hence, surgery might become unavoidable.

Chemist 4 U founder and leading pharmacist Shamir Patel told the publication mentioned above anyone who underwent surgery and experiences the same problem again should seek some medical advice. Although there might be no seriouss issue of pain, a check-up is needed to make sure everything is fine.

As Queen Elizabeth allegedly claimed her knees are playing up, it might hint at further knee problems might arise. The activities she does every single day are surely tiring for anyone. Last year, she attended 283 events. So, continuously putting strain and pressure on her knees without having it checked may end up making the symptoms worse.

"If she is experiencing discomfort, she should certainly take some rest and seek medical advice and support," Patel said. "At the end of the day, her health and wellbeing is the most important thing here."