 [ Symptoms ] my hand shakes the tremor continues and my friends and family noticed it [ Disease ] com caffeine is thought to inhibit the absorption of iron and some of the a and b vitamins so it may be causing depleted vitamin levels and increased anxiety …increased adrenaline levels …and so shaking and tremors in your age it is rarely anything else reduce caffeine and practice some yoga get vitamins in dark leafy vegetables and fruits poultry and meat are rich in b12 also