Juvenil rheumatoid arthritis can cause chronic ...

• urticaria IS kNOWN as Urticaria, or hives, is a common skin condition that affects 15-25% of the population at some point in their lives. Most cases of urticaria are self-limited and of short duration, but when urticaria becomes chronic, it can be a very problematic and frustrating condition, both for the patient and for the clinician. Urticaria is classified as either acute or chronic. Acute urticaria is defined as urticaria that has been present for less than 6 weeks. Chronic urticaria is defined as urticaria that has been continuously or intermittently present for at least 6 weeks. The 6-week period is a guide and not an absolute demarcation.
  When no underlying cause is found, chronic urticaria is referred to as chronic idiopathic urticaria (CIU).
  Angioedema is a condition that involves swelling of the deep dermal and subcutaneous/submucosal tissues. Some patients can have both urticaria and angioedema, occurring simultaneously or separately. Approximately 50% of patients have both urticaria and angioedema, while 40% have urticaria alone, and 10% have angioedema alone. See Angioedema for more details.

so at the end i thought the answer is :

• 
  Systemic lupus erythematosus, rheumatoid arthriti s, juvenile rheumatoid arthritis, or other rheumatological diseases (these are rare causes of urticaria)
• 
  Urticaria has been reported with both hypothyroidism and hyperthyroidism and in euthyroid patients with antithyroid antibodies (ie, vide infra).
• 
  Lymphoreticular malignancies (eg, chronic lymphocytic leukemia

In this article the following is stated: A number of factors have been reported to cause chronic urticaria, and these include the following: Autoimmune disease: Urticaria has been associated with a number of autoimmune diseases, including systemic lupus erythematosus, cryoglobulinemia, juvenile rheumatoid arthritis, and autoimmune thyroid disease (patients may be euthyroid but respond to replacement therapy). http://emedicine.medscape.com/article/1050052-overview