👉 Berylliosis is a rare but potentially life-threatening condition that occurs when a person's immune system mistakenly attacks their own cells, leading to severe symptoms such as fever, chills, body aches, and fatigue. It can occur in any age group, but it is most common in children younger than 10 years old. Symptoms may include rash or blisters on the skin, joint pain, muscle weakness, nausea, vomiting, and difficulty breathing. The exact cause of beryll