Vitamin Deficiency (e.g., Vitamin D or B12 deficiency): This is a common cause of body aches, skin issues, and muscle cramps, especially if the patient has a poor diet or limited sun exposure.

Dehydration or Electrolyte Imbalance: Dehydration or an imbalance of essential electrolytes like potassium, sodium, or magnesium can cause muscle cramps, body aches, and skin sensations.
Hypothyroidism: This condition can lead to muscle aches, cramps, and skin changes, including dryness that might feel prickly.
Fibromyalgia: A chronic condition characterized by widespread muscle pain, fatigue, and tender points, which could also explain the skin prickliness as a sensory sensitivity.

Multiple Myeloma: A type of blood cancer that can cause bone pain (which might be described as body aches), hypercalcemia leading to neurological symptoms and possibly skin sensations, and renal failure leading to electrolyte imbalances and cramping.
Neurological Disorders (e.g., Peripheral Neuropathy): Conditions affecting the nerves can cause a variety of symptoms including pain, cramps, and abnormal skin sensations.
Sepsis or Infection: Systemic infections can cause widespread body aches, and in severe cases, sepsis can lead to multi-organ failure, including skin and muscle manifestations.

Guillain-Barré Syndrome: An autoimmune disorder where the body's immune system mistakenly attacks part of its peripheral nervous system, leading to muscle weakness, and potentially pain and skin sensations.
Sarcoidosis: A disease characterized by abnormal collections of inflammatory cells that can affect multiple parts of the body, including the skin, muscles, and nerves, leading to a wide range of symptoms.
Porphyrias: A group of disorders that can lead to neurological symptoms, including muscle weakness, and skin sensitivity or blistering, although these are less common presentations.