On 12/16/2022 the employee was slinging chains around a concrete block when EE felt a twinge in the neck. EE did not believe it to be serious and did not report it to the supervisor. On 12/19/2022 EE was removing a coupling when EE felt the twinge again. On 12/20/2022, the employee woke up experiencing severe neck pain and stiffness. Employee was diagnosed with a neck strain.