Question

A patient presents with bleeding gums and other signs suggestive of a nutritional deficiency. Considering the role of vitamins in maintaining vascular and tissue integrity, which vitamin deficiency classically causes bleeding gums?

• A. Vitamin C
• B. Vitamin K
• C. Vitamin B12
• D. Vitamin D

Hint:

Vitamin C (Ascorbic Acid) = Proline/Lysine Hydroxylation.
Deficiency = Scurvy.
Classic signs to look for: Swollen/bleeding gums, "corkscrew" hairs, perifollicular hemorrhages, and poor wound healing.

Answer 1

The Correct Option is A

Concept:
A patient presents to the clinic with prominently bleeding, swollen gums, a highly classic and specific mucosal sign of impaired connective tissue structural integrity.
The clinical task is simply to recall the fundamental biochemical roles of vitamins and accurately match this specific, hallmark clinical sign with the correct underlying nutritional vitamin deficiency.
Explanation:
• Bleeding, swollen, and highly friable gums (often accompanied by tooth loss in severe cases) are the absolute clinical hallmark of Scurvy, a severe, historical disease that is caused entirely by a profound dietary deficiency in Vitamin C, chemically known as Ascorbic acid.

• Vitamin C plays a mandatory, irreplaceable biochemical role as a vital electron-donating cofactor for two specific metalloenzymes: prolyl hydroxylase and lysyl hydroxylase.

• Within the rough endoplasmic reticulum of fibroblasts, these specific enzymes are responsible for the critical hydroxylation of proline and lysine amino acid residues on newly synthesized procollagen alpha chains.

• This specific hydroxylation step is absolutely required to allow the procollagen chains to tightly cross-link and twist into a highly stable, strong triple helix structure.

• Without adequate Vitamin C, this hydroxylation fails. The resulting collagen molecules produced by the body are structurally unstable, highly defective, and rapidly degraded.

• Because collagen is the primary structural protein of the human body, providing tensile strength to blood vessel walls and mucosal tissues, its failure leads to profound, widespread connective tissue and capillary vascular fragility.

• Clinically, this catastrophic microvascular fragility manifests most prominently in areas of mechanical stress, causing bleeding gums, widespread perifollicular hemorrhages (bleeding into hair follicles), easy bruising, petechiae, and severely impaired, delayed wound healing.

• While Vitamin K deficiency (Option B) absolutely causes a severe bleeding diathesis (due to failure to gamma-carboxylate clotting factors II, VII, IX, and X), it typically presents with deep tissue bleeds, hematomas, and mucosal bleeding, but the highly specific focal presentation of swollen, hypertrophic, and friable bleeding gums specifically points to the connective tissue failure of Vitamin C deficiency.

• Vitamin B12 (Option C) causes macrocytic anemia and neuropathy, and Vitamin D (Option D) causes rickets or osteomalacia; neither classically causes bleeding gums.
Final Answer:
Severe Vitamin C deficiency causes defective collagen synthesis, leading to profound capillary fragility which classically manifests as swollen, bleeding gums.