This book delivers exactly what its title promises: an easy way to "sort" through most common symptoms in general practice. (Like "weight gain", "facial pain", "backache", "tremor") For each symptom, the most likely causes are described (with easy guidelines for differential diagnosis), followed by progressively unlikely causes. You then get a list of appropriate investigations and a series of "hints & tips" for practical management.
The usefulness of "Symptom Sorter" isn't limited to general practitioners, but extends to undergraduate medical students as well, providing a clear and informative view of symptoms and primary care. The only flaw I can detect is that the book chapters are named with non-medical, common usage terms (this could actually be a pro if the reader is not conversant in medicine).