Digitalis toxicity can manifest in various forms, both cardiac and non-cardiac. Cardiac symptoms include arrhythmias such as ventricular tachycardia, atrioventricular block, and bradycardia. Non-cardiac symptoms can involve the gastrointestinal and central nervous systems, leading to nausea, vomiting, confusion, and visual disturbances such as blurred or yellow vision (xanthopsia).