Urinary crystals and uroliths could  harm cats by causing local or systemic symptoms that could vary from mild to severe. Regardless of the type of stone, the diagnostic methods are the same. However, in addition to detecting the stone alone, revealing the factors causing the formation of the stone is important in increasing the patient's quality of life and in guiding the treatment. In some of these cases, the underlying causes can be revealed, while in others, no cause can be found. Some recent studies have reported that unexplained urinary crystals and uroliths may be associated with many hormonal disorders, especially thyroid hormones. In order to reveal the cause of the struvite stone, hormonal analyses were performed on the patient in the light of current studies, and in the end, although the patient did not show any clinical symptoms, hyperthyroidism was detected in accordance with the studies. As a result, it was concluded that in patients with alkaline urine with sterile struvite crystals and uroliths, it would be beneficial to monitor some hormone levels, especially the thyroid, and to reveal the relationship between struvite and thyroid with more comprehensive studies to be done in the future.