Weakness, fatigue, blurred vision, difficulty breathing, and muscle twitching may indicate symptoms of cholinesterase inhibition, often caused by exposure to pesticides or nerve agents. Cholinesterase, an enzyme crucial for nerve signal transmission, is involved in breaking down acetylcholine. Conversely, elevated cholinesterase levels, though less common, may be linked to certain liver diseases. Monitoring cholinesterase levels is crucial for assessing exposure to specific chemicals or diagnosing medical conditions.