Hydrogels are a general term used for materials with swelling and porous properties of polymeric origin. They consist of interconnected networks of one or more types of polymers with high water-absorption capacity and the ability to carry drugs and small molecular proteins. Due to their wide applications and industrial uses, they have attracted considerable attention. Chitosan-based hydrogels find applications in tissue engineering, drug release, wound healing, and improvement, and due to their diverse industrial applications, they have gained significant interest. The variety in construction and the nature of the primary reactant have led to the production of different hydrogels with various mechanical and rheological properties. Understanding the rheological behavior and the relationship between the chemical structure and the resulting properties is of paramount importance. Chitosan, due to its properties such as biocompatibility, biodegradability, antibacterial, and non-toxic nature, has a wide range of applications in fields such as pharmaceuticals, medicine, cosmetics, health care, agriculture, bio-sensing, and the food industry. In this article, recent studies on the rheology of chitosan hydrogels and the applications of chitosan-containing hydrogels are presented. Given the importance of rheology in materials such as hydrogels, this article aims to provide a comprehensive review of the properties and applications of this category of hydrogels.
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