“…Supporting these data, our previous study (29) in lead/zinc mine workers showed clinical symptoms such as memory loss, diminished concentration, sleeplessness, headache, limping, epigastric pain, lack of appetite, anxiety, tremor, low DTR, deafness, and fatigue. Lead exposure can also end up with abdominal cramps, peripheral and central neuropathy, anaemia, or with vague symptoms such as myalgia, tiredness, bad temper, and headache, or with no symptoms at all (29). In another study, by Zhang et al (30), petrol workers exposed to tetraethyl lead had a signifi cantly higher incidence of tremor and sinus bradycardia than controls, which is similar to our fi ndings.…”