Heavy Metal Poisoning: This condition, such as lead or mercury poisoning, can cause a range of symptoms including alopecia (hair loss), metallic taste in the mouth, and abdominal pain due to the toxic effects of heavy metals on the body's systems.

Thyroid Disorders: Both hypothyroidism and hyperthyroidism can lead to hair loss. Some patients may experience gastrointestinal symptoms like abdominal pain, and alterations in taste, including a metallic taste, can occur.
Autoimmune Disorders: Conditions like lupus or rheumatoid arthritis can cause hair loss and may also lead to abdominal pain due to inflammation of various body parts. Metallic taste can be associated with certain medications used to treat these conditions.
Nutritional Deficiencies: Deficiencies in nutrients like zinc, iron, or biotin can lead to hair loss. Abdominal pain can be related to gastrointestinal issues stemming from these deficiencies, and some may experience changes in taste.

Wilson's Disease: A genetic disorder leading to copper accumulation in the body, which can cause liver disease, neurological symptoms, and psychiatric problems. Early symptoms might include abdominal pain, and while less common, hair loss and changes in taste can occur.
Cancer: Certain types of cancer, such as pancreatic cancer, can cause a range of non-specific symptoms including abdominal pain and changes in taste. Hair loss can be associated with cancer treatment rather than the disease itself, but in some cases, like with pancreatic cancer, it might be an early symptom.

Sjögren's Syndrome: An autoimmune disorder that primarily affects the glands that produce tears and saliva, but can also cause systemic symptoms including hair loss, abdominal pain, and changes in taste.
Porphyrias: A group of disorders that can lead to a buildup of natural chemicals that produce porphyrin in the body. Some types of porphyria can cause abdominal pain, neurological symptoms, and in rare cases, changes in taste and hair loss.