What deficiency causes symptoms such as weakness, bleeding gums, and internal bleeding?

The symptoms of weakness, bleeding gums, and internal bleeding are indicative of a deficiency in Vitamin C, also known as ascorbic acid. Vitamin C is essential for the synthesis of collagen, which is a vital component of connective tissues, skin, and blood vessels. Without sufficient Vitamin C, the body's ability to maintain these tissues is compromised, leading to weakened blood vessels and an increased likelihood of bleeding.

Additionally, Vitamin C plays a key role in the immune system, helping to protect against infections and contributing to overall health. The specific symptoms of bleeding gums and weakened overall health often manifest in severe cases of Vitamin C deficiency, which is historically associated with scurvy. Scurvy results from long-term insufficiency of this vitamin and is characterized by symptoms involving connective tissues and blood vessels, further supporting why this vitamin is linked to the presented symptoms.