Sjögren's syndrome (pSS) is an autoimmune disorder affecting mainly the exocrine glands.this lead to dryness of the main mucosal surface ,such as the mouth ,eye,skin nose,pharynx,larynx and vagina . The history of the disease is characterized by a slowly progression of sicca symptoms and fatigue; however, a subset of patients would experience extra glandular activity. Lipid mediators derived from polyunsaturated fatty acids, related to inflammation and immune response regulation. In this sense, the polyunsaturated fatty acids omega-3 (ω-3 FA) have been associated with several illnesses such as cancer, cardiovascular disease and autoimmune diseases and their balance at the cellular membranes can result in an anti-inflammatory .

this is a randomized double -blind placebo -controlled clinical trial .the participants will be randomize into two groups .Group 1 receive dietary omega-3 supplementation (omega-3 group) whereas Group 2(placebo group) receive a placebo . The two types are similar to each other in the form of soft gel ,both are given two times daily for two months with follow-up of patients whom they full fill the inclusion criteria.

Inclusion Criteria:

• Age≥ 18 and ≤ 70 years old .
• Able to provide inform consent
• Patients diagnosed as syndrome according to 2016 ACR(American college of Rheumatology)/ EULAR(European league Against Rheumatism classification criteria for Sjögren's syndrome

Exclusion Criteria:

• any preexisting ocular disease or on eye drops lubricants.
• patients on (Beta blockers, Diuretics , anticholinergic, α 1antagonist and α 2 agonist ,anticoagulant, antidepressant, antihistamine ,pilocarpine, cevimeline ) .
• past history of diabetes, psychiatric disorder.
• pregnancy, lactating mother
• malignancy