Anxiety disorders are the most common type of mental health problems and comprise of a range of disorders, the most common being Generalized Anxiety Disorder (GAD). Depression is a prevalent clinical condition identified by a lasting and significant low mood, featuring periods of diminished interest, slowed cognitive processes, and decreased voluntary engagement. Thyroid dysfunction has been acknowledged for its substantial impact on mental health, potentially giving rise to disruptions in both emotional well-being and cognitive function. Vitamin D possesses neuroprotective properties, influencing the synthesis of neuromediators, the production and release of neurotrophins, maintaining intracellular calcium homeostasis, and safeguarding nervous tissue from oxidative damage. Most studies examining the correlations between vitamin D and anxiety symptoms have involved a diverse population- healthy adults, patients hospitalized for severe depression and those with medical conditions, but there are few studies which have been done in patients with a primary anxiety disorder. While the role of thyroid hormones has been established in depression, contradicting results have been seen in anxiety disorders. There is a paucity of research on the association of vitamin D and thyroid hormones in patients with GAD. There are very few comparisons of these parameters in patients with GAD and depressive disorder done, and hardly any have been done in patients attending a tertiary care hospital in the Indian Subcontinent.

Patients fulfilling inclusion and exclusion criteria will be taken for the study. Minimum 60 patients will be enrolled for the same. They will be evaluated with the following

scales: Hamilton Rating Scale for Anxiety (HAM-A) will be used to clinically evaluate the patients and rate severity of anxiety symptoms, Hamilton Rating Scale for Depression (HAM-D) will be used to clinically evaluate the patients and rate severity of depressive symptoms, Depression, Anxiety and Stress Scale (DASS-21) will be used to screen patients for depression, anxiety and stress. Blood samples will be

collected for 25-hydroxyvitamin D levels and thyroid function test (fT3, fT4, TSH). Reports of CBC, LFT, KFT, fasting blood glucose and lipid profile (T.Ch, TG, HDL) will be noted from hospital records.

All data will be included with a study ID number and strict confidentiality will be maintained. Statistical analysis and comparison of data will be done using SPSS. Comparison of serum 25-hydroxyvitamin D levels and thyroid function tests will be done by parametric and non-parametric statistical tests, depending upon the nature of the data being normal or skewed Correlation of serum 25-hydroxyvitamin D levels and thyroid function tests with severity of anxiety and depression will be done by Pearson’s correlation coefficient.