State your problem clearly and simply, preferably with a personal angle, and include ideas for solutions. If comprehensive in-depth material is required, include an executive summary. Real letters from real people always are read. Mass mailings are noted but are less effective. Sending a newspaper article and adding a brief comment is sometimes a useful technique.
Most politicians return calls from registered voters in their district.
Do not assume legislators know medical jargon and abbreviations. When in agreement with your legislator on an issue, communicate that agreement. When politicians feel that the public is supportive, they are more likely to promote specific positions and to work to influence other politicians. If legislators are unsure of public support, they may vote the citizen's way, but they do not push the issue as enthusiastically. Letting politicians know when they do something that is appreciated also is important.